Overwhelming Assault
( Player's Handbook II, p. 81)[General]
If you attack a foe who does nothing to turn aside your attack, you press forward with an indomitable strike. Only a fool ignores the deadly threat you present.
Prerequisite
Base attack bonus +15,
Benefit
As a free action, designate one specific foe as the target of this feat. If this foe begins his turn adjacent to you, ends his turn still adjacent to you, and does not attack you, target you with a spell, or use a special ability against you, you gain a +4 bonus on melee attack rolls against him on your next turn.