Quote Originally Posted by Bright-Flower View Post
For arm of the destroyer, the way a FC member tried to explain it to me is that its low potency makes it not worth the energy cost even with a high mob count, but I don't know I haven't mathed it out.
Arm of the Destroyer is only ever worth using on 5+ mobs, but it will burn through your TP fast. So it's far more situational than other AoE abilities, especially due to its low damage.