Simple suggestion!

The Veil Nebula's marine theme would be a perfect opportunity to let us re-battle Celestial Crustaceans met in Journey to Vrederfort Crater quest!

They are the enemies met while doing quest for Demiurge; image under spoiler, dont look if you dont wanna spoil the quest for yourself!



So Im thinking: to those who finished the quest, these enemies could be unlocked to the pool to be met in Veil Nebula! After we defeat them, they are banished somewhere, arent they? It'd be awesome to get to fight them again, and they feel most fitting among jellyfishes and squids!
Even The Cancer can make an apperance again, angry at you for defeating it, as a Boss!