Pretty self explanatory really. I occasionally shift between Swordbreaker and wings of mercy in the arena but I’d be open to More Suggestions. She’s +atk -hp!
Palla has best mixed bulk of all red, non seasonal (lookin’ at you SY! Tiki) fliers, so maybe a build capitalizing on that? 40 spd at max merge seems really low for what looks like a hyper offensive unit.