How Did Ultima Weapon Get The Sword?

[Abraxas]

Didnt Bahamut kill all the researchers? just couldnt remember...........

Nothing about that is ever mentioned in the game. But I guess it's more likely to be Ultima Weapon than Bahamut who caused the whole big mess in DSRF.

Well... I prefer the theory that Bahamut did it. I think the real power the scientist was after was precisely Ultima Weapon, that was "contained", as Adel in space, at the bottom of the sea long time ago. But then Bahamut interrupted the research and killed everyone, using the island as his home.
Thats why he is able to talk to you as you approach the column, instead of Ultima Weapon that suddenly appears as a result of releasing him from his "prison".

How is I perceived it as I was playing...