Psionics

Psionics are a supernatural force capable of being manipulated by psychics. It's also often simply called 'magic' for the sake of simplicity.
Psionics are developed over time through the use of Gleam-based products -- or through raw consumption of it. In time, the brain slowly begins to swell, developing unique faculties that allow the user to carry out psychic powers that alter reality to their liking. Psionics are not without risk, however.

Neural Heat

Excessive use of Psionics causes a build-up of heat within the brains of the user. While their body rapidly evolves to cool this heat off efficiently, excess use of psionics can still cause an over-abundance of heat, which can lead to a psychic meltdown that puts the user into a state of catatonia at best -- at worst, the psychic breakdown can cause catastrophic effects that induces psychosis in more than just the victim suffering through the meltdown.

Psion Sickness

As the mind attunes itself to using Gleam and psionic powers, it slowly begins to develop an ever-increasing dependency on Gleam. Neural heat can also slowly degrade faculties within the brain, and the 'developments' granted within the mind as they learn new psionic powers can also likewise interfere with basic faculties. This wear and tear can slowly lead to 'Psion Sickness'; where the mind has effectively damaged itself beyond repair and left the psychic in a lucid state.
In this lucid state, reality becomes impossible to discern from fantasy, which leads to the inevitable abuse and misuse of their powers. Once diagnosed with Psion Sickness, the victim will only be capable of receiving

Engrams

When psionics develop within the mind, they create an Engram. Engrams are spells that are stored within the brain of the user. They can either be developed naturally -- an occurrence that happens mostly when the brain begins to develop more tolerance and dependency on gleam, or they can be installed through special implants.
Engram implantation is a very dangerous process due to the engram placing further strain on the mind; an over-abundance of engrams can lead towards a build up of neural heat, and while it's become common practice alongside human augmentation, it's still often seen as a dangerous field due to the potential of psychic developing Psion Sickness.

Glimmered Creatures

Creatures that consume enough Gleam or bask in the light of a Dead Star for too long begin to develop psionic powers as well; the same dangers you'd expect in a human can be found in the creatures as well. They can also suffer psychic meltdowns from immense neural heat. However, due to time and evolution, many creatures have grown to develop a tolerance in handling Gleam.
Creatures that develop these psionic traits enter a state that's called 'Gleamed' -- or Glimmered. These creatures give off a light, radiant red glow and possess dangerous psionic powers and bizarre mutations that put them higher on the food chain than usual. They're often hunted for the abundance of gleam that they produced, but are also valued for other exotic traits;
Connoisseurs might find it interesting to sample the meat of a gleamed beast. Some might believe that their flesh is capable of further enhancing the psionic powers of those that eat it -- either way, they're a fine commodity that's frequently sold on the market.

Type

Metaphysical, Psychic