Well, I'm at 47, so here's my 4 options for my 47 and 49 power picks: Essence Drain, Unchain Essence, Hover, and Tactics. Hover is solely for a LOTG, Tactics is for Gaussian proc. That'll leave my 48 and 50 slots for other things. But if I took both Essence Drain and Unchain essence, I can slot them each up to 4, but nothing else I have will get slots.