Final dungeon (term)

Final Boss battles in the Final Fantasy series generally take place in a large, twisting dungeon that has some of the games most powerful enemies and are usually the last area visited in a game.

Final Fantasy
The final battle with Chaos in the original Final Fantasy took place in the Temple of Fiends 2,000 thousand years in the past.

Final Fantasy II
While fighting the Emperor in Final Fantasy II, the final battle takes place in Pandemonium the capitol of Hell.

Final Fantasy III
The Cloud of Darkness is fought in the World of Darkness.

Final Fantasy IV
In Final Fantasy IV the party fights Zeromus after traveling through the Lunar Subterrane.

Final Fantasy V
Neo Exdeath is fought after traveling through the Void.

Final Fantasy VI
Kefka was fought in a massive tower created from random debris, called Kefka's Tower.

Final Fantasy VII
Safer Sephiroth was fought in the very first place where Jenova landed, Northern Crater.

Final Fantasy VIII
Ultimecia, in all her forms, is fought in Ultimecia Castle.

Final Fantasy IX
After traveling through Memoria, the party fight Trance Kuja and Necron.

Final Fantasy X
In Final Fanatsy X, the party travel through the innards of Sin and eventually battle the Final Aeon and Yu Yevon.

Final Fantasy X-2
Yuna, Rikku and Paine battle Vegnagun and Shuyin at the Farplane.

Final Fantasy XII
The party siege the Bahamut and battle Vayne Solidor in all his forms.

Final Fantasy XII: Revenant Wings
Vaan and his friends final battle with Feolthanos takes place in his keep, the Keep of Forgotten Time.

Final Fantasy Tactics
Ramza and his party follow the Lucavi possessed Folmarv Tengille into the Necrohol of Mullonde, where the arch-demon Ultima is being resurrected. The final battle takes place in the Airship Graveyard.