Increases party and raid members' maximum mana by 2126 and causes them to regenerate 326 mana every 5 sec.
Fel Intelligence is a special ability of a Warlock's Felhunter. It provides a passive boost to maximum mana and mana regeneration to party members within 20 yards of the demon.
As with Blood Pact, the effects of this spell does not stack with multiple Felhunters. Therefore, only one warlock per party/raid is needed to have the Felhunter active.
The intellect and increase from this ability does not stack with [Arcane Intellect] and the spirit increase does not stack with [Divine Spirit]. With both a mage and a priest in a raid, this buff is redundant.