Stalker's strike
shaman attack 1
Melee spirit 1
Target: one creature
Attack: Wisdom vs. Fortitude
If the target is bloodied, the attack roll gains a bonus equal to one-half the user's Intelligence modifier.
Hit: "1d10 + Wisdom modifier damage. Until the end of your next turn, your spirit companion can flank with you and your allies."
Level 21: "2d10 + Wisdom modifier damage."[PH2:121]
Stalker's strike is an at-will power granted to shamans who select the Stalker Spirit option for the Companion Spirit class feature at 1st level.