Caustic Adaptation

(Underdark, page 24, DnD 3.5)

[General]

Long have your ancestors hunted and been hunted in the depths. Natural selection has given your blood an unpalatable, acidic quality.

Prerequisite

Kuo-toa

Benefit

A creature that makes a successful bite attack against you takes 1d4 points of acid damage. Creatures immune to poison are not affected.