User blog comment:Kogath/Monster Hunter X Discussion/@comment-25706585-20151005104307/@comment-25083735-20151007021940

If abbyssal lagi does return and so does cedeaus, you would probably fight them here:

Abbysal: A deep underwater cave recently discovered by hunters. The cave is cold with glowing stuff on the walls acting as a natural lightsource so that both the abyssal and hunter can see. in the corner of the map there is an exit back to the deep abyss. the area is big enough to fight abyssal and has stalactites and elevations for mounting. it is also very wet and the nest of abyssal lagiacrus. (Maybe its also the adult gobuls home if it ever gets introduced)

Cedeaus: Someone already said it but fighting it in the great sea but jhen moran style. It would be pretty nice but amatsu is returning so I doubt we'd get cedeaus since amatasu is technically in my mind mhp3rds version of cedeaus.