I hope that you will be able to eat the Fire Emblem people to absorb their powers. This has already had a proof of concept with Kirby in Smash Bros.
Serph devours Marth!
Serph becomes FABULOUS!
Nevermind that, what kind of eugenic shenanigans will I need to pull to breed the Immune Phys skill onto as many demonlings as possible?
But seriously, if this turns out to be yet another useless, phoned in, bare naked, cash grabing, GREE/iOS, card game, I swear to god, I don't care if I have to drive my Chevy to the levy, that'll be the day the gaming died to me. I won't even have enough faith left in me to believe in Xenoblade 2(?) after watching two of the top Japanese game developers sell out like that.