This is a Legendary Weapon from The Cycle: Frontiers' predecessor, The Cycle.

Gun Lore:

Discovered while developing a veltevite-powered plasma cannon, High Amplitude Zender Emissions were found to have an effect remarkable similar to the effect of energy field known as "The Cycle", though the decaying plasma core fueling it is much shorter lived than the anomaly surrounding Fortuna III.

A slow firing launcher, projectiles create a harming energy field on impact. Further discharges of the launcher into an active field into it, until reaching a critical point resulting in a devastating release of energy.