Kujata

Kujata (クジャタ, Kujata), also known as Kjata, is a beast, usually in the form of a summon. It takes the form of a bull with multiple horns and eyes.

Final Fantasy VII
Tetra-Disaster jA6Va2gyPnQ Kjata (correctly translated as Kujata in the PC release) can be found at the Bone Village. On the second level of the village, the player must head west into the forest. At the screen right before entering the Sleeping Forest, a red dot will randomly appear and move around the screen. This is the Kjata Materia. Chase it and pick it up to acquire it. Kjata requires 110 MP to summon.

When summoned, Kjata cycles through four elements in order of Lightning, Ice, Fire, and Earth to all enemies, revealing its true form in an explosion of light before the final blow, in an attack called Tetra-Disaster. However, if an enemy is immune or absorbs one of the elements, the entire attack is negated or absorbed by the enemy.

 Level -- AP required 
 * Level 1 -- 0
 * Level 2 -- 22,000
 * Level 3 -- 60,000
 * Level 4 -- 90,000
 * MASTER -- 140,000

 Stat Changes 
 * Magic +1
 * Magic Defense +1
 * Maximum HP -5%
 * Maximum MP +5%

Before Crisis -Final Fantasy VII-
Kujata can be summoned in battle using the appropriate Materia in this game.

Final Fantasy XI
Though Kujata does not appear as a summon in Final Fantasy XI, it is the name of a server.

Final Fantasy XIII
Kujata is the fal'Cie that supplies power to Euride Gorge.

Etymology
This summon is derived from the Arabian myth of Bahamut, an enormous fish on which the bull, Kujuta, stands. Kujuta has four thousand eyes, and the equal amount of ears, mouths, noses, tongues, and feet, with a distance of a journey of 500 years between each of them (e.g. from eye to eye). On the back of Kujuta is a giant mountain of ruby, and on top of that mountain is an angel, who supports six hells, the earth, and seven heavens.