Burning Vapors

Prerequisite: 11th level
Benefit: You gain a +3 feat bonus to acid damage rolls. This bonus increases to +4 at 21st level.
    In addition, whenever you take acid damage from an attack, each enemy adjacent to you takes a -2 penalty to attack rolls until the end of its next turn.

Published in Heroes of the Elemental Chaos, page(s) 142.