Arrival

The ability to dream-traverse was discovered by dream masters.

By making use of their dream world, dream masters would be able to quickly locate other realms, allowing their True Spirits to descend and harvest the realm. This process allowed the dream masters to quickly advance and become more powerful.

However, all these were gone together with the lost of the dream dao.

"Strictly speaking, dream masters are not the only ones who can move through realms and locate other realms. Realms of higher dimensions are also able to do it to prey on other planes and harvest from them… However, the process of dream-traversing would consume the least energy and allow the dream traverser to gain more rewards, considering the energy exhausted."