Energy Drain reduces the cooldown of the Super and nades faster than usual. Not that much faster but it's noticable Life Steal triggers your regen instantly. Pretty useful in pvp. Could save your life several times. The Hunger increases the portion that is returned to you instantly Embrace the Void only triggers Energy Drain, in the sense of any kills made in that time will reduce the cooldown more. Strategically a good choice as you can use the effect more often in that case. Bloom merely lets enemies explode which have been killed by your abilities. Any enemies killed by the bloom wont explode.