(エンシェントマーメイモン AncientMermaimon)
AncientMermaidmon b
Title Demon Beast of the Seabed
(海底の悪魔獣 Kaitei no Akuma-jū?)
Level Mega
Type Ancient Aquatic Beast Man
Attribute Data
Family Unknown
Deep Savers
Partners Facile
Cards (Ja:) St-914, Bo-843, Bo-1044
Ten Legendary Warriors

AncientMermaidmon is an Ancient Aquatic Beast Man Digimon. Possessing the attribute of "Water", it is one of the Ten Legendary Warriors that saved the ancient Digital World. A Mega who existed only in the distant past, it is the guardian goddess of the birthplace of Digimon, the "Net Ocean", ruling the whole of it and able to handle all water, such as the ocean currents and tidal waves, as if they were its own limbs. It is said that countless continents and islands have been erased when AncientMermaidmon felt angry.[1] Its abilities were later passed on to the "Aquatic Digimon".[2]


  • Great Maelstrom: Generates a gigantic maelstrom which swallows everything in the water.
  • Crystal Billow: Crystallizes water into supersolids, then fires them off like a machine gun.



AncientMermaimon (エンシェントマーメイモン)

Official romanization given by the Digimon Reference Book and used in Japanese media.


Name used in the American English version of Digimon Story: Cyber Sleuth and other American English media.


Digimon Frontier

D-Tector 2.0 and 3.0

Digimon Story: Super Xros Wars Red and Blue

AncientMermaidmon is a Mega-level Digimon. It can be digifused during battle from Mermaimon, Whamon, Scorpiomon, and Coelamon, and will attack with "Great Maelstrom". It can also be formed from a DigiMelody.

Notes and references