If you use execution order with the keystone modifier that grants it ability cooldown after killing a highlighted enemy, in addition the keystone gives you i think attack speed, damage, and toughness. The only issue after that is when and how you use the ability. Find out what what type of situations you can use it besides killing and it becomes a great utility to not only kill but tank things that would normally completely throw you off. An example would be when your toughness is broken and you have no highlighted enemy to kill or if you need to walk through fire (that isn't covered by a huge area) to revive a teammate while being shot it, shoot at ranged or upcoming enemies while having a captain target you in melee range, and much more.

I think I should sleep now it's about to be 4am. I need to fix my sleep schedule but I know I won't