I should tell you now that her natural trait the Dark Seraphim drain has been used from the start, each post he'll feel slightly weaker, steadily. Closer he is to her, the faster it is. Think of it as in times modes, so far away it's like a x5 effect, slower. Close up it's x10 effect, faster. More he uses power up close, the more it drains. Due to him using energy.