Rank 1 Increases the damage done or health drained by your Drain Life, Drain Soul, and Wrack spells by 4% per each of your other Affliction effects active on the target, up to a maximum increase of 12%.
Rank 2 Increases the damage done or health drained by your Drain Life, Drain Soul, and Wrack spells by 8% per each of your other Affliction effects active on the target, up to a maximum increase of 24%.
Rank 3 Increases the damage done or health drained by your Drain Life, Drain Soul, and Wrack spells by 12% per each of your other Affliction effects active on the target, up to a maximum increase of 36%.