|Debut||Digimon Story: Cyber Sleuth|
|Prior forms||Angewomon + LadyDevimon|
Mastemon is an Angel Digimon. It is an Angel Digimon who manipulates light and darkness, and has the power to cross through space-time.
- Chaos Degradation (Chaos Degrade)
- Mastemon (マスティモン)
Name used in the franchise. No official romanization available.
Digimon Story: Cyber Sleuth
Mastemon can DNA digivolve from Angewomon and LadyDevimon. One of them must be Level 60 or above and both need to have 120 Max SP, 120 ATK, 120 INT, 80 ABI, 100 CAM. Aiba needs to see Mirei's Mastemon before being able to obtain their own.