Scenario: Masquerade (Boss Battle)

Boss: Blueblood Count Rosier

At the start of the battle, just send your demons and let them pummel the boss. It has an area-of-effect skill that can deal continuous damage and stun Arnice and her servans within its range. You'll know when the boss activates it when you see a circular sigil forming on the floor around it. With most of its HP intact, the boss will just slowly attack you with its fiery sword. This attack can be very easily anticipated and dodged.

About 75% in its HP, the boss will summon floating musical instruments. These can be destroyed easily by attacking them directly. They won't do anything special at this point except to act like rotating satellites protecting the boss. Continue attacking the boss while regularly stepping back before he activates his area stun attack and destroy the instruments he summons.

At around 50% of the boss's HP, the instruments will become powered up and can be used by the boss to attack you. When purple sigils appear on the floor, do your best to avoid stepping over them to prevent getting damaged. He can still summon the instruments but they're harder to destroy and can damage anyone else that touches them. When its HP goes down around 30-35%, the boss will have the ability to lock your ability to summon for a short period of time. It seems to do it only once per battle so when it does, keep your distance and fight defensively until you can summon your servans again, especially your healer.

It's attacks become more powerful and the instruments themselves can be used in a variety of more damaging attacks. Servans will be a good way of keeping the heat off of you while also delivering much needed damage. can also perform one special attack that will deal a HUGE amount of damage but won't be enough to instantly kill you. This starts with a quick charge that can be evaded but it seems that the boss will keep attempting this until it's able to grab you and trigger its special attack. Perform quick combos to recover your SP faster then summon your servans again. Continue the onslaught while taking care not to soak up damage from the boss's attacks until you defeat it.