strawberry floating hell
Rest assured, that is the hardest boss in the game. Seriously though, main Melia. She is amazing in that fight, the AI is totally strawberry floating gooseberry fool with her.
How she works, you basically press a button on a spell, then hit the middle button to release the attack. She has this double cast ability which is pretty good, it repeats the previous elemental attack, negating cooldown.
Edit -
Worth mentioning, the boss has this increase in physical defence when there's a few of those Nova things spawned. Keep two of them alive.
4 novas → 100%
3 novas → 55%
2 novas → -5%
1 nova → -80%
0 novas → -100%
It's a strawberry floating silly boss. Not sure why they didn't fix it.