Ojean
The Ojean were servitors of Zahd, Taznikanze God of War and the Seas. Ojean were large whale-like creatures with many tendrils. Huge, perhaps the largest beings ever to exist in the World of Mana, Ojean are capable of swallong a longship whole. Such a huge creature could only survive underwater, and though they could breath air and water, on land they would be crushed by their own weight.
Ojean were capable of giving any other creature the ability to breath underwater. They were capable of communicating telephatically, and a few were extremely powerful psionists.
Killing an Ojean was almost impossible, although some very powerful magic users were able to.
By the time of Kupopolis Proper, no Ojean are known to still be living, and the whales that were their primary food source have long been extinct in the Mana Dimension.