humans fused their souls with spirits from another dimension. This fusion created a new race of people known as the Kalashtar. From the fusion, a dual mind occurred, the rogue spirit and your own. The spirit does not talk to its human, but it gives intuition to its human.
The dimension or reality from which these spirits are from is a psionic place known as Dal Quor, the region of dreams. When a creature dreams, the creature connects psychically to Dal Quor. Their dreams mold a pocket of reality along the fringes of it. At the center of Dal Quor is Quor Tarai. The Quor Tarai created entities called the Quori. The Quori are immortal beings that live in Dal Quor. The Quori feed at the psychic energy of dreaming creatures that visit Dal Quor in their sleep.
Because of the Kalashtar's spirit within, they have limited psionic abilities that let them talk to other creatures telepathically and also, they don't dream. The spirit within the human has severed their connection to the plane of dreams. The Kalashtar also cannot obtain Dragonmarks.
The Kalashtar's only religion to follow is the Path of Light, the great light that must be followed to save the world from an eternity of nightmare and evil from the Dreaming Dark.
In Nolis, the Kalashtar is a myth. But in reality, there are groups of Kalashtar in the low hundreds hidden in the many forests or other secluded areas of Nolis. The Kalashtar hides from the general public due to the fact that an abundance of them may cause trouble for the plane.