It works. They can't cast it because they lack MP. Since Gau doesn't waste any MP when casting spells during a rage, he CAN cast it.Originally Posted by Vivi22
I don't think I used it during the first part of the sky battle, but if I remember correctly, I did use it during the battle after Ultros. I think the Rhinox absorbs thunder-based attacks. And if i remember correctly, that boss use a lot of thunder-based attacks. So by having Gau in Rhinox-rage, he become pretty much unbeatable as he absorbed most of the attacks and constantly casted Life 3 on himself.