Increases Killing Cloud and Poison Burst damage by 15%.
If refine rate is 7 or higher, increases Killing Cloud and Poison Burst damage by additional 15%.
If refine rate is 9 or higher, increases Killing Cloud and Poison Burst damage by additional 15%, reduces skill cooldown of Poison Burst by 0.5 seconds.
If refine rate is 11 or higher, increases Killing Cloud and Poison Burst damage by additional 15%, increases Venom Swamp damage by 15%.