Serpent Strike Fighting

Paragon Tier
Prerequisite: 11th level, Str 17, Dex 17, Two-Weapon Fighting
Benefit: While you hold a spear in one hand and a flail in the other, targets hit by your opportunity attacks take a -2 penalty to AC until the end of your next turn.

Published in Dragon Magazine Annual, Dragon Magazine 368, page(s) 58.