>>385401324
Chaos Bolt is a solid pick. Good dmg with okay speed but sometimes 2nd cast has to be canceled. Also it works because shields are criminally underrated. 
For the dash Chaos > Unholy > Frost. 
Chaos gives insane mobility, double immunity frames and 25% x2 + 50% x2 spell dmg.
Unholy 5sec (8sec cd) 25% dmg increase is extremely underrated.
Frost 125% shield + snare just a no brainer.
Haven't tried much ults yet. Using Mirror Strike atm but it requires a set up with a stun and enemy dash on CD.
For weapons all you want is to plug that sweet Spear's main "Q" skill in the enemy butt. Other weapons are situational whether your "Q" or "E" are up, if you need ranged/melee control or a gap closer.