Guide:
You will rely on your skulls, so your main focus is to kill things, not necessarily heroes, but camps, troopers, whatever. Anything to get the charges on your skull jar. Always put your 2 behind enemies when beginning engagements where you're confident you got the upper hand, and whenever using essence theft, always target bullet heroes (I'm coming for you haze). For ult, it's useful in lane for pressuring the enemy and their tower. Also good for lane pressure if they can't find it, so always put it hidden somewhere, for it to not be punched.0 items