Zyzakk seem to emit light, which is always colored blue.
It is uncertain whether Zyzakk are true lifeforms, energy-based, a type of Boltzmann entity, or something else entirely. However, they are known to change shape, often taking a sort of insectoid appearance.
Zyzakk are only sighted very rarely, usually at the edges of universes. The first sighting occurred sometime approximately 3 million AM, leading some to believe they have developed recently.