Spirit Realm
収録元: Mysticism
The Spirit Realm (dimension)
To enter the Spirit Realm one must fly to the roof at the praying platform in the labyrinth with 20K - 30K EP, because else they will die to magic poisoning.
To exit the Spirit Realm in 1.19 you will need to find a portal/big structure within any of the 7 biomes. (images provided within the biome links.)
In 1.21.1 you just need to fall into the void.
You can go into a singleplayer test world and use /locate while in the dimension to see what these structures look like!