Simple enough. It's a boss that is optional and stronger/harder than the final boss of the game. Here's a quick run-down for the main series:Originally Posted by Shaibana
I - Warmech (NES/PS1 versions only, it's too weak in the later re-releases)
IV - Zeromus EG and Brachioraidos (GBA/PSP), or Geryon and Proto-Babil (DS)
V - Omega, Shinryu, Enuo, Omega Mk.II, Neo Shinryu
VI - Kaiser Dragon and Omega Weapon
VII - Ruby Weapon and Emerald Weapon
VIII - Ultima Weapon and Omega Weapon
IX - Hades and Ozma
X - Omega Weapon (PAL/International version only, it's way too easy in the first release), the Monster Arena creations, the Dark Aeons and Penance
XI - Pandemonium Warden and Absolute Virtue, and probably others I don't know about
XII - Ultima, Zodiark, Hell Wyrm, Yiazmat, Omega Mark XII, the five Judge Magisters (Trial Mode Stage 100)
XIII - Vercingetorix and Long Gui
XIV - Ifrit and Nael Deus Darnus under certain conditions.
...That's it for the most part.
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