Contract Killer Attack 20Certainty of Death
A vicious attack from a hidden position gives you the opportunity to eliminate the target with a single strike.
No Action Special
Trigger: You hit a bloodied enemy with an at-will attack power, and you are hidden from it.
Effect: The triggering attack deals 5d8 extra damage to the enemy, and it grants combat advantage until the end of your next turn.
Published in The Book of Vile Darkness, page(s) 1-23.