Dreghulan

Dreghulan was the first world to be created and is by far the world with the most concentrated runic energy. This is due to the Tsera Shrine being located on this world. Dreghulan was originally created to host life, however due to it being the first world, runic energy was able to enter easily and distort basic laws of gravity. The world was clearly uninhabitable, however the gods did not cleanse it from the runic energy due the possibility of worsening the situation. Staying in this world for an extended period of time would inflict symptoms related to the Crimson Plague, however your conscious would deteriorate and your body would exist until your it decomposed. Though the chances of corruption are relative to your state of mind and emotions.