The Carcosa supplement introduces a rule where hit dice are not rolled until combat begins. The hit die size is also determined randomly. At the start of an encounter, HD are rolled and left in front of each player. Damage is then inflicted upon the die with highest face value first. For example, a character with three rolled HD of 5, 4, and 2 takes damage to the 5 die first. If a die is reduced to zero, it is removed entirely from the character’s pool and only returned in the case of healing. If that character only takes (say) 3 damage during an encounter, all three HD are retained, and there is no persistent damage. I have used this system, and though it does take a bit getting used to, it works in practice more smoothly than it reads.

This approach has a number of properties that may be disentangled if desired. First, determining the die size randomly increases the uncertainty of combat. Though higher level characters are on average tougher than lower level characters, when combat starts you may be rolling four-sided dice for HP, twelve-sided dice, or something else. Second, rolling a handful of dice and letting them sit in front of you eases the tracking of damage, as there is no HP tally. You just have a max HD value written on your character sheet, and a remaining pool of dice in front of you.

I think the second property would work well without the first (that is, rolling the HD at the beginning of combat, but not determining the HD size randomly). It would be especially convenient using OD&D style all six-sided HD, given the ubiquity of six-siders. How to handle bonus HP would need to be determined (the second term in an HD expression such as 1+1 or the bonus from constitution). The most satisfactory method would probably be to have a series of static “bonus” hit dice to represent those extra HP which would not be rolled. For example, assuming values from Men & Magic, a fifth level fighter with an exceptional constitution has 5+1 HD and +5 HP. This could be represented as 5d6 rolled plus one die set down with a “6” value. Handling penalties seems more tedious, and I cannot think of a better system right now than needing to adjust each die downward after rolling them. The B/X bonus scale of -3 to +3 also would require more bonus dice, with a mid-level high-constitution character having several “static” HD worth of bonuses, but it seems like that would not be overly cumbersome.

Using a system like this also opens up the possibility of using hit dice as other sorts of resources. For some ideas along those lines, see:

• Combat dice
• Spell dice

Using HD as resources could require re-rolling them, removing them from the pool entirely, only removing them in the case of rolls less than (or greater than) the current rolled face value, or any other number of ways to modulate potential die removal.

HP determination could also be deferred until damage is rolled, as described here:

• Deferred hit points

Rereading that post, however, I think it is probably less immediately approachable than the kind of modified Carcosa die system outlined here.

 

The equipment deterioration rules (originally inspired by Logan) that I posted before have seen around 10 sessions of online play testing. In general, I like the idea, but in practice I found that the large number of notches tended to prevent the effects from ever showing up on-screen. Rolling another die on every notch to test for immediate breakage is also too much work (and easy to forget, being outside the standard D&D workflow). The replacement costs I made up were a bit too complicated.

This new version of the rules (included below) feels “finished” to me, though I have only used them for two sessions so far. The complexity overhead and game impact are about where I want them. The new version does away with “null result” notch accumulation while also giving players some warning before their weapon or armor is totally gone.

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There are three different gear states: sound, damaged, and ruined. On rolls less than or equal to an item’s quality rating, the item drops a category, which decreases its effectiveness in the case of “damaged.” Repairing a damaged weapon costs 1/2 new price. Some actions may cause an automatic downgrade, such as hitting a statue with an axe. Damaged weapons deal less damage and damaged armor loses one point of protection.

Expanding on the previous idea of modeling combat between two foes with a single roll (monologic combat) rather than a pair of rolls, here is an extended example.

Dramatis personae:

• Magic-user (PC, level 2, unarmored, dagger, fire wand, HD 1+1, HP 4)
• Fighter (PC, level 2, armor 3, sword, shield, crossbow, HD 2+1, HP 8)
• Thief (PC, level 2, armor 1, crossbow, dagger, sword, HD 2, HP 7)
• Torchbearer (PC magic-user’s retainer, level 0, armor 1, lantern, dagger, HD 1, HP 4)
• 4 goblins (monsters, armor 1, short bow, cleaver sword, HD 1-1, HP 3)
• A six-legged giant lizard the size of an ox (monster, armor 2, HD 5, HP 20)
• Goblin beast master captain (monster, armor 3, axe, whip, HD 3, HP 11)

The scene: a cavern bisected by a crevasse with a narrow stone bridge of ancient provenance. An underground river flows quick and cold, 100 feet below the bridge. The player characters wish to take the bridge and proceed to the tunnel leading out of the cavern’s far side.

Lantern light and a snarling giant lizard make it so neither side is surprised (because I want this example to be less of a one-sided engagement). Surprise could be determined using the standard d6 per side method. I am also going to decide that the goblins are out for blood, but in a real game I would probably roll for reaction.

Initiative is important to determine in this system, because going first means you can choose your engagement (if you are not already occupied). Retreating or disengaging requires a successful combat action. To determine if initiative is gained, each player makes a combat check versus a threat number that the referee determines by ruling to represent the opposing forces. In this case, it is 3 (based on the leader’s level; note that this could change based on balance of forces as the skirmish progresses), leading to a target number of 13. Any player that makes this roll (1d20 + combat bonus) acts before the monsters. Otherwise, after. Spell casting must be declared before the initiative die is rolled, and in that case no movement may be taken. Spells resolve at the end of the round. The magic-user elects to begin casting a spell, charm person, against the goblin captain, while remaining in the cavern entrance behind the other party members. (The magic-user’s other prepared spell is hold portal). The fighter and thief succeed in their initiative check. So the order is: fighter, thief, monsters, magic-user, torchbearer (who acts on the magic-user’s count).

The thief chooses to move to the side and take aim at the lizard. Next round, he will be able to take a shot with backstab advantages since the lizard is not yet in melee (a rule I just made up). The fighter (armed with sword and shield) is going to charge across the bridge and take the fight to the goblin archer brigade. Despite winning initiative, the fighter is still going to need to defend against the goblin arrows this round (consuming her combat action), given that missile weapons beat melee weapons (if she was using a missile weapon, she would have a chance to inflict damage as well, but in this case she will not). However, her shield will grant her a +2 combat bonus since she is facing arrows. The goblin archers are ganging up (+1 each, up to +4 max; it seems like these are the “helping” rules). So the final roll is 1d20 + 3 (fighter combat bonus) + 2 (fighter shield) = 1d20 + 5 versus 10 + 0 (goblin combat bonus) + 3 (gang up) = target number 13. Fighter rolls 9, which is 14, and thus defends successfully against the volley. (Had it hit, the gang up bonus would have applied to damage as well.) The fighter’s action resolves and she is now in melee with the goblins, but has already made her combat roll. Thus, the goblins take no damage, but are still in melee and will not be able to fire their missile weapons without disengaging. They have also already used their action and thus will be passed over on the monster count.

Next is the thief, who moves and aims. (A stealth check might be permitted here to make it so that the thief cannot be targeted by enemies until an action triggers, but I am not going to worry about that now.) Now the monsters act. This is just the lizard and the captain, as the archers have already made their attack. Further, the bridge is currently threatened by the fighter in melee with the archers, so advance over the bridge is impossible. The fighter is surrounded in the front by mooks scrambling to hold the fighter at bay, so the referee rules that the lizard cannot enter the melee (not having any reach attacks). However, the captain has a whip, which is a reach weapon, and so will attempt to grapple the fighter at reach and pull her prone so that the goblins may attempt to overwhelm her. The fighter makes another defense roll, with no modifiers applying, of 1d20 + 3 versus 10 + 3 (captain HD) = 13. There is no chance of the fighter damaging the captain, both because the fighter has already spent her action and because she is not wielding a weapon with reach threat and is constrained by the archers. She rolls badly, 5 (+3 = 8), and is pulled prone under the stamping nasty feet of the small goblin horde. The lizard can’t do anything and so retains its combat roll for potential reaction (which will be lost if nothing triggers it by the end of the round).

Finally, the magic-user and torchbearer act. The chanting ceases and the spell goes off. Traditionally this would require the goblin captain to make a saving throw versus spells, which is what I am going to go with here, but in some ways I might prefer a magic-user roll versus target magic defense (which should be lower than the combat defense number based on HD unless the target is magical in some way). But whatever, the referee is just going to break the elegance of the system and make a saving throw for the goblin captain, because I have not thought enough about this part of the system and do not want to accidentally homogenize spell casting and physical combat. The captain rolls 18, making the save. Unfortunate, but it happens. The torchbearer is doing nothing, cowering next to the magic-user, maintaining the light source and reserving his action for potential self-defense.

Next round. If the fighter was not already exposed up in melee, the magic-user might opt to spend the hold portal spell for a blast of acid maleficence, but in this case that is deemed too dangerous, so no spell casting is declared. Initiative is rolled. The fighter is prone and so gains no combat bonus to initiative. (Another discovered rule!) The fighter fails and will act after the monsters, the magic-user and thief succeed, so they will act first. The magic-user defers, not having a spell to cast, and being too far away to throw a dagger (referee ruling). The thief takes the backstab shot (had the lizard been in melee by this point, the shot would no longer have backstab bonuses and instead would be subject to whatever penalties are involved with shooting into melee; probably random target determination). The thief’s combat roll is 1d20 + 2 (combat bonus) + 4 (backstab) = +6 versus 10 + 5 (lizard threat level) = 15. The roll is 16, +6 is 22, which is enough to hit, dealing 1d6 + 1d6 (backstab bonus) + 1d6 (hit margin more than 4) – 2 (lizard armor) = 4 + 5 + 4 – 2 = 11 damage. The lizard is now at 9 HP. (Yes, traditionally the backstab is a multiplier, but I prefer additional damage dice. The overkill bonus is another new rule.) The lizard rears up in agony.

Monsters turn. Still prone, the fighter remains dangerous but looses her attack bonus. The goblins drop their bows and set upon her with cleavers, hacking and chopping. The fighter rolls 1d20 to defend (no bonuses, because prone), versus target number of 10, four times (the monsters are opting for separate attacks rather than ganging up). First roll is 11, successfully defending. Fighter is opting not to count this as her action so that she can attempt to regain her footing and thus get back her attack bonus when her turn comes around. Second three rolls are not so lucky however; 3, 7, and 9. The fighter is thus damaged by three goblins, 1d6 each, for 5, 4, and 6 damage. Her heavy armor subtracts 3 from each of those rolls, leading to 2 + 1 + 3 = 6 damage, leaving her with 2 HP. Can the captain or lizard get off an attack here? I am going to say no, but melee threat rules probably need to be more formalized, because I could see it going either way. Since the captain and lizard are still bottlenecked, their actions are held for reactivity.

Now the fighter acts. She could try to fight from prone (no attack bonus, no fancy maneuvers, no potential cleave), or use the combat action to stand up. Had the goblin mooks not already used their combat roll to stomp all over her, this would have the potential of damaging her, but in this case there is no chance of damage on either side and the roll is just to see if she can regain her footing. 1d20 + 0 (remember, no attack bonus because prone) versus 10 (goblin threat level). The roll is 12, and she throws off the chopping and cackling goblins, ready for another round (but a bit worn down, at only 2 HP).

Round three. Magic-user starts to cast maleficence at the captain (only a single target, limiting overall damage potential, but safer). Fighter and magic-user succeed on initiative. Thief fails. So the order is fighter, magic-user (torchbearer), monsters, thief. The fighter attacks the mooks surrounding her, and the combat roll is 13 + 3 (attack bonus) for 16, which is enough to hit a goblin (target number being 10, the 1-1 HD not contributing). Hit margin is more than 4, adding an extra die of damage. Damage roll is 5 + 2, running one goblin through, and allowing another attack against a nearby goblin if desired, with a +1 bonus (cleave). Thus another combat roll is made, this time 5 + 3 (for attack bonus) + 1 (for cleave) = 9, which fails, resulting in the goblin hitting the fighter, d6 damage = 5 – 3 (for fighter armor 3), dealing 2 point of damage to the fighter and slaying her. The three remaining goblins hoot with glee. The magic-user’s spell is still going even though he won initiative, and will resolve at the end of the round.

Now the monsters go. The mooks and lizard will charge across the bridge and attempt to get to the magic-user before the spell goes off. Though the thief lost initiative, he is able to take a shot at the leading goblin since he has a missile weapon (and is not in any danger doing so because all the enemies are currently only armed with melee weapons and so cannot shoot back). He hits and kills one of the charging goblins, who plummets into the chasm with a shriek. Two mooks, a wounded lizard, and an unwounded captain (who stayed on the far side of the chasm) remain. The referee rules that the charge by the monsters was slowed by the successful arrow shot, and thus they are not able to attack this round, or disrupt the spell (some formalization of these movement rules would probably be welcome, as this feels a bit arbitrary to me). The spell goes off and the captain fails his save, taking the full 2d6 acid damage (which ignores armor). The damage roll is lucky, 5 + 6 = 11, burning the face and half of the chest off of the captain, leaving a smoking corpse with protruding ribs and a sickening smell. In their bloodlust, the mooks don’t notice their leader fall (otherwise, they would need to pass a morale check at the beginning of the next round).

Back to initiative. The thief succeeds, the magic-user fails, the fighter player takes over the torchbearer (and fails). So the order is thief, monsters, magic-user, torchbearer. The thief takes this opportunity to hide, and climb partly up the walls of the cavern. He makes his stealth (or hide, whatever) check. (Hiding would not have been an option had he been in melee or if the captain on the other side of the chasm was still alive.) The monsters act, only two able to bring offense to bear on the magic-user given the narrow confines of the passage. The referee dices to see which, and it is one mook and the lizard. The magic user rolls defense, brandishing a dagger, attempting frantically to keep the monsters away. The player opts to not attempt a counterattack, as that would consume the magic-user’s action, and the player wants to attempt to break from melee and flee. Unfortunately, the two rolls go badly for the magic-user, 3 and 9, and both enemies hit. The magic-user is unarmored, and takes the full brunt of gnashing lizard teeth and goblin cleaver, for 3 + 4 = 7 damage, which kills him.

The torchbearer attempts to flee, but fails his combat roll and is cut down by cleavers during the next round (which I won’t bother detailing). The thief waits above as the monsters feast on the corpses, and then slinks away once the coast is clear. And so ends this example combat.

Note that one could easily swap in a different system for determining surprise (or many other aspects of this combat), without substantively affecting the underlying dynamics. For example, a roll less than or equal to dexterity could be used for initiative rather than attack bonus versus monster threat level.

I am not entirely satisfied with how ranged combat was handled here. Should the goblins have automatically been able to force defense on the fighter? Similarly, should the thief have been able to take a bow shot as the mooks were crossing the bridge? It makes sense fictionally, but could also be represented with initiative bonuses, perhaps. In that case though, the group of monsters should probably be partitioned into two groups, ranged and non-ranged, which starts to increase the complexity in a way that seems like might be a hassle at the table. Distances seem important for the charging actions, and I am not sure the way I modeled that above is best.

The first melee attack of the goblins against the fighter could perhaps have used helping rules, which would have used a single combat roll with bonuses and extra damage on a hit. This might make sense to overcome armor, but I would want to make sure that expected damage (taking everything into consideration) does not yield a consistently optimal strategy. I think that is beyond the scope of this post, though.

• Hit dice values from rationalized hit dice
• Attack bonuses based on hit dice
• Increasing cleave bonus taken from James Y.
• Rules governing maleficence

The traditional D&D combat system is sometimes criticized as being “whiffy,” which means that missed attacks are frequent and frustrating. The idea is that, especially when there are a large number of players, it kind of sucks when your turn comes around, you finally make your attack roll… and miss. Nothing happens and then you need to wait for the next round before you can do anything.

Now, I do not believe this is a major problem with old school D&D, particularly where combat is often something to be avoided or stacked in your favor prior to engagement, and where HP totals are relatively low, even for powerful creatures, leading to quick resolution. The occasional miss, miss, charm spell… save made (nothing happens), miss, etc sort of combat happens, but is rare. This is obviously a bigger issue in a game like Third or Fourth Edition, where combat is more of the focus, but in a game focused on exploration and creative problem solving, it is less important. With that caveat out of the way, might there be a way to make old school combat even faster and more interesting by taking this complaint seriously? Here is one method.

When the players decide to engage an enemy in combat, an attack rolls is made as normal. If it hits, damage is dealt (or an effect happens, depending on the circumstances). If the attack misses, however, the enemy succeeds in damaging the PC. “Automatically.” Automatically is in scare quotes there because of course it was not actually automatic. The player first needed to engage the enemy, which put the PC in danger, and then the roll went badly. Either the enemy takes damage or the PC takes damage, driving the eventual conclusion in one direction or the other on every action. HP being abstract, this of course does not mean that someone is physically being wounded (though it could), but instead that one side is getting the best of it for that particular combat turn.

Since what we really care about here when making at attack using this system is the threat level of the enemy, not the enemy’s armor or defensive skill specifically, the target number should probably be based on enemy HD or level rather than using a traditional armor-based AC number (though the actual fictional meaning of AC has always been a bit ambiguous). 10 + HD seems like the natural, intuitive value. This means that when a first level fighter (assume no attack bonus, for simplicity) attacks another first level fighter, the target number is going to be around 11, leading to a roughly even chance of the either combatant taking damage (5% in one direction or the other is irrelevant, and in any case the numbers can be adjust to make this work in any mathematically desired way). Armor is probably best represented as damage reduction (light = DR 1, medium = DR 2, heavy = DR 3), given that monsters never make attack rolls directly. At most, an enemy forces a PC into a position where they must defend themselves.

And how exactly might that work, given that monsters don’t make attack rolls per se? The simplest answer is that each combatant takes an action and resolution happens as necessary. If this results in a PC attacking and then defending themselves from other enemies as well, it seems like that would work, though combat rolls could also be limited (perhaps to one per round, or something based on level). This could make being surrounded particularly dangerous, if you can only defend against one attack (the others would presumably just deal damage minus armor). The benefit to a proactive versus reactive combat roll is of course that you get to choose your target, rather than having your hand forced by a particular enemy.

How to handle some other common cases using this system might not be immediately obvious, but are not too difficult to figure out with a bit of thought regarding the underlying dynamics. What about missile weapons, for example? If it is possible for foes to engage each other with missile attacks, the player makes a combat roll. On success, the enemy takes some damage, assuming that makes sense in terms of what the PC is doing (the PC would need to be armed with a missile weapon to actually deal damage over distance). On failure, the PC takes a shot to face (or whatever).

This is partially inspired by Dungeon World and Numenera. However, this is not just a port of either of those systems. Dungeon world involves more mechanical choices depending on move details rather than using a separate mechanic to represent combat abstractly. Numenera uses a system for lowering the target number rather than stacking bonuses, which requires understanding how various powers and situational actions can be used to do this. Neither of those approaches are bad, of course, and though their player-focused design has informed this system, the end results are a bit different.

There are a few other details that would probably need to be nailed down to make this fully functional. There are also a few additional features that I think would work well as added tactical options, but I am going to leave it here for the sake of comprehensibility.

Edit: I wrote up an example of a potential monologic combat.

I love the idea of (Diablo style) finding things like a rusty axe and (not Diablo style) having that actually be useful. So that’s the motivation behind this system. I would probably pair it with a silver standard for XP while leaving weapon costs in GP. So a long sword might cost 150 SP (15 GP, looking at the Swords & Wizardry Complete price list), but expected treasure found per level would be much less.

This is totally a knockoff of Logan’s notch idea. I’m just posting my formulation here so that I can reference it. I think Brush of Fumbling came up with rolling under the quality number. See also Goblin Punch, which reminded me about this whole thing not too long ago (I think there was another relevant post on Arnold’s blog, but I can’t find it right now).

Note: an updated, simplified version of this system is here:

http://www.necropraxis.com/2014/04/14/equipment-deterioration-simplified/

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Weapon quality ranges from 1 to 5, with 1 being best and 3 being default. Attack rolls less than or equal to the quality number result in a point of wear. Make a mark next to the item on the character sheet to track this.

Armor quality ranges from 20 to 16, with 20 being best and 18 being default. Wear accrues to armor as described for weapons above, but the relevant roll is the enemy attack (so when an enemy rolls high to hit you, your armor will take wear).

After three points of wear, an item becomes damaged, and becomes less effective (one less point of AC protection for armor, and -1 to attack rolls for weapons). Additionally, every time a damaged item takes wear, there is a quality in 6 chance that it is ruined outright (jumps immediately to six points of wear).

Six points of wear indicate that an item is ruined (falls apart, snaps in half, etc).

Repair costs are 1/6 of new cost per point of wear.

Item costs double per quality rank (round any fractions up). For example, a item that costs 10 GP (100 SP) on the rulebook price list (representing the default quality of 3), would result in the following price chart by quality:

1. 400 SP
2. 200 SP
3. 100 SP
4. 50 SP
5. 25 SP

Items other than weapons and armor (such as grappling hooks) may accrue wear as well.

2013-11-27 edit: damaged items have a quality in 6 chance of being ruined when taking a point of wear rather than 50%.

Here is a weapons quick reference PDF (see downloads page). Some properties are also keyed to training and mastery (as described in the recently posted warrior class). When I used these rules in person, I found it invaluable to have everything on a single, easy to reference piece of paper.

For ease of reference, I have also included the rules contained in the PDF below.

The properties here are simplified from my previous effort.

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Weapons

Weapon	Properties	Trained	Mastered
Club	bludgeon		stun
Dagger		throwable	auto-hit after grapple
Spear	reach	throwable	interposing
Staff	two-handed, bludgeon	+1 AC	parry (melee)

Weapon	Properties	Mastered
Short sword		+2 attack in formation
Short bow		+2 attack with aim
Sling	unencumbering, versatile ammo	N/A

Weapon	Properties	Mastered
Axe	minimum damage 2	hits destroy an item
Mace, war hammer	bludgeon, +2 vs. armor	+4 vs. heavy armor
Long sword		riposte
Pole arm	two-handed, reach, 2DTH	interposing
Two-handed sword	two-handed, 2DTH	riposte
Long bow		volley

All weapons deal one die of damage. Attack rolls are penalized by four with untrained weapons. Mastered weapons deal an extra point of damage. Some weapon options only become available with training or mastery.

Weapon Properties

2DTH

Roll two dice for damage and take the highest result (2DTH stands for “2 Dice, Take Highest”).

Interposing

Opponents must make a saving throw to get past the weapon and make an attack. If this saving throw is failed, a die of damage is sustained.

Riposte

Enemies that miss the wielder with a melee strike and roll a natural five or less on the attack roll take a die of damage.

Stun

A successful hit requires the enemy to make a saving throw in addition to the standard damage inflicted. If that saving throw is failed, the enemy may not take an action during the next turn. Stuns are only effective against enemies of the same size or smaller than the weapon wielder.

Volley

Up to six shots (roll a die) may be taken in a single round, though the targets are determined randomly.

Crossbows

There are no penalties for using a crossbow without training. There are also no benefits gained from training or mastery. Given this ease of use, the crossbow is a weapon for the masses, and is renowned for its value against heavily armored troops. As such, crossbows are often controlled munitions, and will usually be forbidden to all other than those in official uniforms.

Weapon	Properties
Crossbow	+2 vs. armor, +4 vs. heavy armor, requires a round to reload