The final boss to beat in the expansion to is the Source of the Abyss, a familiar face that has haunted the characters of the story.
This Shadow of regrets made manifest summons Personas of their own to combat your team. The only way to beat this foe is to recognize your group's weaknesses and exploit them to move forward.
From this point on, expect heavy spoilers regarding the identity of the final boss of and the conclusion of the game's story.
Just like in expansion for the original, the final boss of is the protagonist — the character you played throughout the main game.
Met at the bottom of the Abyss of Time, this shadow must be defeated to destroy the dark realm. Unlike other shadows encountered in , the Source of the Abyss is a very different boss fight than what you might expect.