Your critical hits with acid attacks also damage foes near your opponent.
Benefit: When you score a critical hit with an attack that deals acid damage, you also deal acid damage to every foe adjacent to your target. The acid damage dealt is equal to 1d6 per critical multiple for critical hits made with a weapon, and equal to 1d6 for every 2 levels of a spell (minimum 1d6) for critical hits scored with a spell.
The Genius Guide To: Feats of Critical Combat. Copyright 2010, Super Genius Games. Author: Owen K.C. Stephens