A being with incredible willpower, perfect focus, and endless patience, can make their way through the ordeals necessary to become a psionic lich. The only way to kill one is by destroying its mummified corpse, without which its mind will dissipate in the astral.
What it wants: Inscrutable. Many liches act in ways that seem random: observing unimportant doings, making seemingly inconsequential adjustments to the world, or simply wandering, gazing implacably at whatever they encounter. Others pursue obsessive tasks, building labyrinths, shifting rivers, experimenting with animals. A few have understandable goals, such as protecting nations or eradicating certain monsters.
What it needs: Nothing.
Where it comes from: Potential psychics must practice meditation. If they have the talent, diligence can uncover it. Once their talent emerges, they must continue their meditation to refine their power. To become a lich, they must gain perfect self-knowledge. When they believe they have have succeeded, they must prepare their body. They will drink nothing but a special tea, containing toxins that polymerize the body, shutting down a preserving organs one by one. When this process is complete they will be paralyzed, and must be sealed in clay and buried in an unmarked hole. If their self-knowledge is truly perfect, their psychic power will allow them to survive the death of their body. They will be trapped in their mummy, but their mind will persist. After centuries of constant meditation, they will learn to create an avatar of pure willpower, with which they can interact with the world.
What it will fight for: The avatar of a psionic lich will engage in combat only if it doing so is interesting to it. Otherwise, they will leave. The exception is if its body is threatened, in which case the lich will not retreat and continually escalate the fight, tearing apart the area with psionic force.
What happens if you eat it: The flesh was toxic when buried and its time beneath the earth has not improved it. Also, this would be cannibalism.
What can be crafted out of it: Mummy leather blocks psychic influence, making it useful for shields, armor, and wallpaper. The dirt surrounding the mummy is often suffused with psionic energy and is prized by psions as a stimulant.