Personally, I think Nox is overrated.

You need to charge it in order for it to cause AoE Dmg. I'd prefer to hit 3 skills, or 2 skills and auto attack, as compared to charging 1 skill for mediocre AoE Dmg.

Don't get me wrong, I think Nox is a great skill for boss kills but when purely looking at quick AoE Dmg, nox isn't all that great due to the fact that you need to charge it.

At least that's my opinion about it