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Martial doom
warlord attack 3

Target: one creature

Attack: Strength vs. AC

Hit: "2[W] + Strength modifier damage, and the target grants combat advantage to your allies until the end of your next turn."

Effect: "Any ally that hits the target with an attack gained from spending an action point before the end of your next turn deals 5 extra damage to the target."

Martial doom is a 3rd-level warlord encounter attack power. It causes its target to take extra damage from allies' action point attacks. On a hit, the target also takes damage and grants combat advantage to allies.[Dr384:51]

Martial doom was introduced in "Class Acts: Warlord: Keys to the Battlefield" by Robert J. Schwalb in Dragon #384.

It is rated as a good choice, being a significant benefit for focusing attacks on a single target.