Efforts to avoid the monster’s attacks of opportunity usually fail.
Benefit: Once per round, when a foe takes an action that would normally provoke an attack of opportunity from the monster, and no attack is provoked due to a skill check, feat, spell or other ability the foe possesses, the monster may make a CMB check against the target. On a successful check, the monster may take an attack of opportunity on the target.
#1 With a Bullet Point: 10 Monster Feats. Copyright 2011, Super Genius Games. Author: Owen K.C. Stephens