I am having trouble with the Mammoth. I try to take out the enemies summoned by it before attacking the Mammoth itself, but then he summons more, so I thought that leaving a couple alive would keep him from summoning more, but that doesn't help either. My characters are each at Lv.24 with a lot of the available skills (sufficiently leveled). You'd think that I would've gotten past him by now and after several attempts...
for every boss, use moves that attack its weakness(then again, do that with every enemy :P) so limit breaks to use for mammoth are the nuke(lance), black hole(natalie), and cleaver(matt)