Erylia is the campaign setting for the actual play Dungeons and Dragons podcast, Adventures in Erylia. Most of the work done so far focuses on the continent of Syvahl, where it all started for me. Though I do have some concepts thought up for other parts of the world, the story so far takes place on Syvahl.
I would place Erylia as being on the lower end of high fantasy. There are gods, based on the D&D Gaelic pantheon. There are other planes, which I call realms. And there is definitely magic, including an entire floating city. However, while magic is a thing in the world, it is a little bit more restricted than standard D&D. A clear example of this are the homebrew mechanics for resurrection.
Currently there are only a few planes to the world of Erylia. The mortal plane is simply known as Erylia. Outside of Erylia lies Caelistra, the realm of the gods. Caelistra is inhabited by the gods and the spirits of mortals the gods have taken a particular liking to. The souls of the dead not lucky enough to be invited to live on Caelistra find themselves in the Sea of Lost Souls. Beyond Caelistra is The Abyss. The Abyss is unknown to the mortals, and unspoken of by the gods.