Here's my take on a stage for bahamut's ultra form [fan-made]
The stats of the new enemies and stage schematic are shown at the beginning of the video. In short, the main boss of the stage is a variant of bahablast(enemy), but with 10000 damage on the second and third multihits, along with 900 piercing range on those attacks. These multhits cannot damage the base, it is mainly there to guarantee the miniwave and miniwave spawn, which also spawn on those multihits, along side a 30% chance to savage blow on those hits. This makes it harder to time meatshields in between his attacks. He also has 100% delay to reset any units' cooldown, making attackers more valuable and may only be worth using on the peons. The other main enemy is a variant of filibuster that has less range but no wave/surge immune, letting him be sniped by units like slime and doron to interupt his attacks, though slime will have to be timed well to not be killed by bahamut. The other enemies are simply peons, which are quite self explanatory. Lastly, this map is played out like a special cats true form awakening stage, where there is an easier first stage before the hard stage, so while this stage is quite difficult, it is near nothing compared to the next stage which I'm to lazy to make for a while, so in the meantime, enjoy the above footage...or don't, I won't force you.