Ullikummi

Notes:

 * Spawned by trading a Diorite to the ???.
 * Killable by: 12 characters level 70+, 6 characters level 74-75; Solo as RDM75/NIN37; Duo with BLM75/WHM37 and NIN75/WAR37.
 * Casts Banishga III, Diaga II, and Flash.
 * Almost exclusively uses Heavy Strike.

Historical Background
In Hurrian (Anatolian) mythology (the Hurrians were a people who resided in northern Mesopotamia, roughly where modern Turkey, Syria, and Iraq have their borders meet), Ullikummi was a giant stone monster which grew so rapidly and so large, it towered from the shoulders of Upelluri, a dreaming god (who like the Greek Titan Atlas is holding up the heavens), to the heavens. Ullikummi posed a threat to the gods who dwelt in the heavens, but none of them could harm it. The gods considered abandoning their dwelling, but Ea noticed where Ullikummi's feet were positioned. Ullikummi's feet were cut off with a copper saw by the god Ea, causing the giant to topple and be destroyed. Ullikummi was specifically made out of volcanic rock. Ullikummi was created by Kumarbi, a god who sired all other gods and who once ruled but who was deposed by the storm god Teshub, one of his sons, to get revenge on Teshub and the other gods. Ullikummi was said to be 9000 leagues tall (that's 27,000 miles or 45,000km. For reference, the diameter of Earth is 12,756km and the diameter of Neptune is 49,528km).

Video
See Video.