Secrets of the Immortals
Shadowrealms are like other dimensions. They are pocket dimensions mainly that can take on any form. Extremely powerful beings can create these as well as some legendary weapons. An example is Prometheus’s shadowrealm. It is a volcanic realm that has fire everywhere. It was created by Prometheus himself and serves as a mainstay of his power. The only way to enter a shadowrealm is to know where it’s doorway on the material plane is.