Warlock · Demonology · tier 1 · from level 10

Improved Health Funnel

Rank 2/2

Increases the amount of health transferred by your Health Funnel spell by 40%, reduces its health cost by 30%, and reduces all threat your Health Funnel generates by 100%. Allows Health Funnel to be used regardless of your demon's health.

Doesn't change the damage or healing of any Warlock spell.

Plan a Warlock build

Averages, counting crits and misses, for a level 60 Warlock with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.