Hotfix (2011-04-27):Marked for Death is now applied properly to the target of Arcane Shot or Chimera Shot, allowing for focus macros (i.e. /cast [@focus] Chimera Shot) to apply Marked for Death to the focused target and not the primary target.
Patch 4.0.1 (2010-10-12): Redesigned. Now makes your Arcane Shot and Chimera Shot have a chance to apply the Marked of Death effect.
Previously increased damage done by the hunter's shots and special abilities, and increased critical strike damage bonus of Aimed Shot, Steady Shot, Kill Shot and Chimera Shot.