Warlock · Demonology · tier 4 · from level 25 · needs 2 points in Master Summoner
Fel Domination
Fel Domination
Rank 1/1
Your next Imp, Voidwalker, Succubus, Incubus, or Felhunter Summon spell has its casting time reduced by 5.5 sec and its Mana cost reduced by 50%.
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.