Elidibus

Elidibs is a legendary wizard from Final Fantasy Tactics that has hidden on the lowest level of the Deep Dungeon. Exactly how he came to be in possession of the Serpentarius Zodiac Stone, the secret thirteenth stone, is unclear, but he is able to transform into a Lucavi of the same name. Elidibs has the role of an optional boss; if fought, he would come between Adramelk and Hashmalum.

Fighting Elidibs
Ramza Beoulve will encounter Elidibs in the pitch-black final floor of the Deep Dungeon. He will immediately transform into Lucavi form when spotted, and is quite powerful, packing almost as many Hit Points as Altima's second form. He is backed up by several Apandas, but Ramza's team gets a guest for this battle: Byblos, a special Apanda. Elidibs himself packs several powerful spells, including the move Zodiac, which can be learned Blue Mage style (it is part of the Summoner class, so bring a well-equipped Summoner to this battle if you wish to learn it).