Moroes, Gruul and Maulgar.

So, here are some short but sweet reports.

Moroes
He randomly became untargetable half way through the fight and didn't ever become targetable again.

Gruul
He now does his shatter mechanic, or at least half does it. There is no knockback and the shatter oneshot everyone but the tank even though people were adequately spread prior to shatter casting.

Maulgar
So, I know I mentioned that he should be harder and more hectic at the start but I did not intend to have a starter gear tank lose 70% of the HP every 2 seconds. The adds do way too much damage and need to be toned down a little, this is simply just a case of you guys overtuning the fight.

Wow we left this one unaswered, sorry! As for the problems:
MOROES: fixed
Gruul: We added knockback mechanic, but with no damage afterwards. Afterall T4 content is just a starter one, T5 will be the first difficult one ;-)
Maulgar: It's fully doable, tested multiple times with less than average group.