Medon meaning demons are created by Vex to cause havoc on the planet Zen has created. They can come in different designs but the main style are a dark gooey body form with a skeleton inside and the skull outside of the gooey body. Vex try to do want Zen can do but failed and created a human that looks nothing like what Vex wanted. Despite this Vex still use Medon to do their biting.
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They tries to force people to the dark side without the people knowing. They roam in certain locations of the planet and can travel to different universes.

They can communicate through the peoples Luminescence/Chimerics (aka The Mind).

Some people think their just their own minds either tricking them or just random and other thinks their real.

These Medon can live forever so death is nonexistence.