Bestial Death Strike

Paragon Tier
Prerequisite: 11th level, ranger, Beast Mastery class feature (boar or lizard)
Benefit: Your beast companion gains a +1 bonus to attack rolls while bloodied.
In addition, when your beast companion drops to 0 hit points, it can make a melee basic attack as a free action.

Published in Martial Power 2, page(s) 141.