Rotation

Spender / 25% chance to fire trick arrow

Knockdown / aoe

use twice after  / 100% chance to fire trick arrow

Applies Vulnerability / big Damage

Fully charge for huge damage / 100% chance to fire trick arrow

Slow lowers attack and move speed -50% / 

use when use cooldown goes away

Stuns enemy if you hit them/ Attack speed buff / breaks CC

Gear

 or   cobras hood is better but not by much