Master Poisoner is the Assassination rogue secondary stat attunement, focusing on Mastery.
- Previous effect: Increases the spell damage taken by any target you have poisoned by 5%.
- Patch 5.0.4 (2012-08-28): Spell damage taken by the target reduced from 8% to 5%, and no longer reduces the duration of all Poison effects applied to the rogue.
- Patch 4.0.1 (2010-10-12): Reduced to 1 rank. Moved from tier 9 to tier 5. No longer increases chance to critically hit poisoned targets, but increases magical damage taken by the target instead.