After you hit your enemy with a telling blow, you hold your weapon ready for a killing stroke if the enemy tries to escape.

Encounter   ✦     Martial, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 4[W] + Strength modifier damage. You gain a +5 power bonus to attack rolls and damage rolls with opportunity attacks against the target until the end of your next turn.

Published in Dark Sun Campaign Setting, page(s) 89.