Well going off of warlocks, the voidwalker melee is called Energy Drain, and you can see where im going with this. It probably feels like all the energy in your body just evaporating. You know like that feeling of despair when you feel everything leave your body or a better example, when your right on the border of falling asleep and you can feel everything just leaving you. This is a really good comparison because think of when you jolt awake. One second you feel completely empty the next second you feel overloaded with energy. God damn it im rambling again....