Dragon Lich infused with a strong Mist. Hunted in the Stilshrine of Miriam.
How to find
Map of Myath's approximate spawn point.
The player must have spoken to the "Huntmaster" in Phon Coast and defeated Thalassinon to start the Hunt Club quest. Myath then appears in the Ward of Velitation area of the Stilshrine of Miriam after the player kills the three Dragon Aevises in the room, leaves and returns. Like all trophy game, once it is killed, Myath will never reappear.
A possible origin of the Japanese name is "myth", but it could also be "Mysto" or another variant.