One of the Ten Legendary Warriors that saved the Ancient Digital World, possessing the attribute of Water. A Mega that existed in the far-distant past, AncientMermaimon is the guardian goddess of the Net Ocean, the birthplace of all Digimon. It rules over the entire expanse of the Net Ocean, where it control currents, waves, and any other water as if it was its own limbs. Countless continents and islands are said to have vanished due to AncientMermaimon’s wrath. The abilities of AncientMermaimon would later be inherited by Aquatic Digimon and others. Its special move Great Maelstrom creates a giant whirlpool that sucks everything into its vortex, and Crystal Billow crystallizes water into a super-hard substance before firing it like a machine gun.