>>51081533I feel like you posted your answer. Angels are pretty strongly death-themed, plus Serafi in particular has the whole skull aesthetic, and you already have an underground thing with her, right? Planet-spanning angelic catacombs, maybe in a world where the surface is uninhabitable.
If a world where the surface pressure is too low maybe you could end up having livable atmosphere if you dig down deep enough, since pressure increases with depth.
>>51081760Those too!
