Exdeath
The FF5 final boss. Exdeath was a tree in the forest of Mua that became possessed by a dark spirit. He was defeated first by the Four Warriors of Dawn, who sealed him in Butz's world. He was then defeated three times by Butz, Cara, Faris and Lenna. When you visit the Cleft of Dimension in FB, the amount of monsters are almost nil. Exdeath is trapped deep within the Void. You can get him out by a number of ways, but you'll always bargain with him. He will join you in order to help you to kill the All-Monster, but his real goal is to get out of the Void.
Abilities:
Magic: He starts with Holy and other powerful spells.
Morph: After some development has occured, he can morph into Neo Exdeath or into his tree form.
Void Control: When you start out, his Void Control is incredibly weak. You'll have to work it up through combat.
Ultimate Equipment:
Void Armor: Armor (including shield, helmet, gauntlets and armor) fashioned out of pure Void. You get these by returning to the Void and fighting the Void itself. When you do so, you get the armors, Ultimate Personal Power for Exdeath and Void Control for your whole party.
Exdeath's Slayer: Find this after getting Ultimate Personal Power by visiting the place where he was sealed. The remaining energy will refine itself into his ultimate sword. You can improve it by visiting Mua.
Ultimate Personal Power:
Fight the Void. Afterwards, Exdeath will finally learn what the Void "is" and master it and himself.
Element Granted by Spekkio:
Shadow.
Limit Breaks:
ULB:
Fight the Void: Exdeath's first ULB, gained from experience. The poor enemy is a innocent bystander to a war between Exdeath and the Void.
Exdeath: Exdeath's second ULB, gained from fighting the Void; this is the better one.
Img. 1 from a FF5 Walkthrough. Image 2 and 3 taken by me. Image 4 taken from RPGamer, who took it from Square's original artwork.
Exdeath in armor form (Img. 1 from left)
NeoExdeath (Img.2 from left)
Exdeath in tree form (Img. 3 from left)
Square artwork of Exdeath (Img. 4 bottom)