Everyone here talking about Rex’s this and Rex’s that is foolish. Maybe 4 Rex’s to tank a little and the rest Mut Theriz packed full of Veggie Cakes. The fire melts the Rex’s even with ascended saddles. And all our Rex’s were 35k hp+.
Bring Therizinos instead of Rex’s, since herbivores take reduced damage from the fire, and can eat sweet vegetable cakes to regen health quickly. Take about 17-18 theriz, 2 hell pigs, and 1 yuty as well as an OP rocket launcher or shotgun, or substitute 4 theriz for allo’s to get the bleed attack.