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Inevitable wave
warlord attack 1

Special: A character can use inevitable wave instead of the melee basic attack or bull rush part of a charge action.

Target: one creature

Attack: Strength vs. AC

Hit: "1[W] + Strength modifier damage. Until the end of your next turn, any ally who charges the target deals extra damage equal to your Intelligence modifier.
"Level 21: 2[W] + Strength modifier damage."[PHH2:MH4]

Inevitable wave is an at-will power available to warlords at 1st level.