Warlock · Demonology · tier 2 · from level 15
Fel Vitality
Fel Vitality
Rank 3/3
Increases the maximum health and Mana of your Imp, Voidwalker, Succubus, Incubus, and Felhunter by 15%, and increases your maximum Mana by 15%.
Doesn't change the damage or healing of any Warlock spell.
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.