Those saying it's the power of friendship, the way I see it it's more like life drain, drain the life-force of allies or enemies to self-heal or gain a DPS boost, the princess even says use my life for whatever she said after that but yeah I see it as life drain, I don't remember if in WoW DKs had life drain but if my memory is right in FF14 the DK had those don't know if they still do though, been a long time I have not played that game