Oh yes!

1) The skull that the island is made from comes from an ancient deity whose sibling is Kerata's own divine ancestor.

2) A large portion of the island's surface is covered in forests of enormous trees with great canopies, which means that a lot of the time the forest floor is rather dark and murky. The trees there are somewhat intelligent and emit a dull hum which is actually them praying for rain.

3) Kerata wasn't born there, but migrated there from a nearby island along with several other demons when it became clear that a volcano eruption was going to destroy it.

4) Since the island is a skull, it has huge hollows and tunnels inside of it where the sinus cavities and eyes would be. There is a whole ecosystem located within these hollows and demons within it are known as Deep Dweller while demons living on the surface are Surface Dweller.

5) Kerata's territory on the island is a smaller forest at the bottom of a downward sloping valley. There's a chasm in it that leads to the hollows so Kerata spends an equal amount of time being a Deep Dweller and Surface Dweller.

6) There are several domes scattered across the island, which angels and giants used as factories to create humans for labor purposes. Most of them are abandoned, but a select few still contain automated nurseries for creating more humans. Without angels or giants to guide them, the humans there basically worship the golems that monitor the domes. Some of these domes have ran out of the alchemical solution that was used to physically mature human slaves, so now there are basically small isolated villages of permachilds 😭. Fy-la is from one of these villages.