Persona 3 Reload: Shadow of the Void (Merciless / Orpheus Only)

Or Abaddon with arguably a cooler design than how he normally is in SMT / Persona.

Abaddon is the Final boss of Monad besides Elizabeth, the Superboss who I don't know if I'll have the patience to do that with Restrictions. Abaddon itself can be easy or annoying cause its Main gimmick is that every turn it heals for 300 hp, so it's a DPS Test at ghe point where you have some of the Strongest Personas in the game and has no weakness. Unless you do it solo or are Underleveled its not difficult to defeat at all.

I have two recordings of this fight and this is with a not too ideal team (If I brought Koromaru who now has Debilitate it's significantly easier to defeat).

Abaddon has access to many Endgame skills, Charge, Concentrate, Poison Mist and Heat Riser. It can also Heal with Diarahan, Abaddon will waste turns after a while and it can run out of SP eventually if you're patient.

Strategy is simple, buff, heal, and chip away.