Considering when Dream Selves and Prospit and Derse were explained, the least I could say would be I was a little confused. If you wouldn't mind explaining them in more simpler terms compared to Homestuck's explanation, it would be greatly appreciated! c:

A dream self is an extra body for the player that remains asleep until they’re woken up. Everyone’s dreamself can be awoken differently. They can change their appearance but lose this ability if the main body dies. If the player wants to ascend on their Quest Bed then the dream self must be alive. When the player dies on the bed, their dreamself will ascend to godtier. If the player uses their Sacrificial Slab, which is located in the center of the moons of Derse and Prospit, then they don’t need an extra body.