Bahamut Replace Doom Gaze/DeathGaze?

@Tin Man thank goodness that's the answer I want to hear it yes it is If I won't do the dialog for Bahamut then the only option is battle text in FF3UsME and yeah I need to modify the event of custom boss hack event.....If you asking me exactly what I want to achieve and how I wish to achieve as we know in W.O.R we encountered Doom Gaze/Death Gaze in random battle and we get The Bahamut esper upon defeat this creature and it so boring to fight Doom Gaze over and over until it dies.So all I want is to change the new event ala FF5 advance in different way but like you said need to modify more things in custom event, so I need help from the experts to making this happen.
The AI battle scripts, sprite image from this creature and the skill moves are ready but only problem is yeah the event but I won't delete the event for Doom Gaze as the replacement for Bahamut.As the battleground in the GBA/SNES version of FF5 usually Bahamut appear and fought in mountains(I don't know what is name) in Merged World, so I only think is either the clouds(AirForce's Battle in World of Balance), top of mountains(Various place) or both of them I can't decide.about the BGM I like theme of FF5 titled "Sealed Book" in replace for ff6's "Another World of Beasts" as change BGM cause I believe this is the same where bahamut appeared....So that's all I can say matee.....