Supernatural Instincts
(Fiendish Codex II: Tyrants of the Nine Hells, page 85, DnD 3.5)
[General]
Your uncanny insight enables you to take advantage of the subtle opportunities created when an opponent uses supernatural abilities against you.
Prerequisite
Benefit
When a creature you threaten uses a supernatural ability, it provokes an attack of opportunity from you. Unlike a spell or spell-like ability, though, a successful hit does not require the target to succeed on a Concentration check to continue to make use of the supernatural ability.
Normal
Supernatural abilities do not provoke attacks of opportunity.