You close in for the kill when you sense your enemy's reserves failing, then compel the foe's allies to stay for the slaughter.

Daily   ✦     Martial, Reliable, Stance, Weapon
Standard Action      Melee weapon

Target: One bloodied creature

Attack: Primary ability vs. AC

Hit: 4[W] + ability modifier damage. You can assume the finishing strike stance. Until the stance ends, whenever you deal damage to a bloodied enemy with an attack, each enemy adjacent to the bloodied enemy is immobilized until the end of your next turn.

Published in Dark Sun Campaign Setting, page(s) 52.