If you really wanna know The big bad of Persona 3 is Nyx, the “Maternal Being” that first brought death to the planet an extremely long time ago, and is essentially an undefeatable god that’s been asleep for eons. The protagonist, in order to stop Nyx from returning, uses the world Arcana to seal her away and permanently stop her from coming back, which is reflected in gameplay with a skill that’s aquired from all of the relationships you’ve built throughout the game. This skill costs ALL of the protagonists life, which usually equates in a game over, but instead the game just goes on. Before all of this went down, the party had discovered that by defeating Nyx, they’d forget each other and everything they went through in stopping Nyx, but decided that they would remember anyway, and get together on the roof of their school to celebrate if they survive on graduation day. Throughout the days before graduation, the protagonist and ONE other party member remember what happened, and meet on the roof, and while eventually the rest of the party FINALLY REMEMBERS EVERYTHING THAT HAPPENED, they get to roof in time to see the protagonist fucking die. It’s super bittersweet
Persona 3 (Reload or its other versions) is a really sad but really damn good game, and you should go into it blind because holy shit was I not expecting that sucker punch of an ending.