Source: Wikipedia
Spell, Magic-User 2
Open an extradimensional rift to the acid seas of Erankzix. This causes a blast of violet, sparkling acid. If targetting a single creature directly, this does 3d6 damage, save for half. The 3 dice may also be distributed between several clustered targets (for example, two dice to one target, one die to another). Will weaken most physical objects if cast on them directly, providing a bonus to open doors or similar checks. The acid itself phases slowly back to Erankzix within one exploration turn, leaving a worthless residue of purple dust laced with mica. The acid is resisted by glass, rock, and organic bone.
If this works using an extradimensional rift I’d like to see chances of something else coming through with it!
Acid blast with chance of acid crab.
Some interesting possibilities with this spell. I look forward to experimenting with it.