He’s very complicated at first, but easy after I tell you this shortcut. To activate his ult tap it once (no need to hold it) then tap again to pull enemies in. While your ult is activated you can press any other skill not on cooldown.
You're delusional 😆 but still a nice yang. You should be getting the soul eater on him atleast so you can throw up that shield more often and damage increases its block ammount. This way damage makes him into a tank.