M-DEUS is an optional secret boss from Tokyo Mirage Sessions ♯FE that can only be fought in a New Game+. He is the true form of Nieg, the Phantom Mirage that trades Incenses to Itsuki in exchange for Detritus in the Urahara Arena. King says that he is a Mage Dragon and an ally of Medeus. He can fought by being spoken to at the Arena and selecting the option, "I want to challenge you to a battle." King then takes on his true form of M-DEUS, and the battle begins.
He is an extra-powerful boss patterned after Medeus with a level of 99, making him the most challenging fight in the game on all difficulty levels. When defeated, Nieg will give Itsuki a Luck Incense.
In-Game
Base Stats
| Starting Class | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 Dark Dragon | |||||||||
| Level | HP | EP | Str | Mag | Skl | Spd | Lck | Def | Res |
| 99 | ? | ? | ? | ? | ? | ? | ? | ? | ? |
 |  |  |  |  |  |  |  |  |  |
| Repel | Repel | Repel | Repel | Repel | Repel | Repel | Repel | -- | Null |
| Skills | Items | ||||||||
| Command | Session | Passive | -- | ||||||
| Tail
 Dies Irae | -- | -- | |||||||
Etymology
M-DEUS's name is a direct play on Medeus. "Deus" is also the Latin word for "god."
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