In the second episode of season 2 we can see the Inferno Stronghold and on the door lock there are these symbols. I think they stand for the different kingdoms or places.
The gemstone = Bentwood
The castle with the three towers = Dreamland
The lollipop = Elfwood
The gearwheel = Steamland
The star = Mermaid Island
The demon tail = Hell
The demon symbol = Maru
I don't know what the anchor stands for, but maybe for Atoll K. We see the name Atoll K in Skybert's electrofish. It would also go together, a submarine and an anchor
What do you think?