Esper Graphics

It sounds like to me you're wanting the enemy to cast "Bahamut" and it to kill both parties, or at least the enemy party who casted it. If that's the case, I can help you with the script if needed, you shouldn't need to edit FF6MDE at all for it that I can think of.

Not quite, I succeeded in the enemy casting Bahamut, the battle script making it do so and the party that gets damaged all seems to work just fine, it's just that when Bahamut is casted by the enemy party, the player's party disappears during the animation of Bahamut, I want to reverse that so the enemy that casts Bahamut disappears for that short time instead

This is also because I replaced the sprite for Bahamut with the sprite of the specific enemy I want casting it, I'm using FFVIMDE so I can change the animation to see if the player's party disappearing is part of the 3 part animation of Bahamut (a good majority of the rest of the editing is just with FF3usME V. 6.5 and FF3se...the only thing I haven't really used very much is FF6LE)

I guess I'll just test some stuff to see which 14-bit Animation string triggers the player's party's disappearing act for now.