Shin Megami Tensei: Persona 3 Cheats - PlayStation 2
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Unlock Monad Block
Reach Tartarus at the 254th Floor to unlock Monad Block (monsters in Monad are hard and they are at over level 90).
Unlock Izanagi-no-Okami
After completing the game with the true ending and starting a New Game+, a new fusion section will unlock and you'll be able to fuse Izanagi-no-Okami, one of the best Personas in the game.