Radion

Radions are titanic multi-megameter automatons possessing numerous dishes and antennae on a tall geometric bodey.

Radions roam around the galaxy at sublight speed beaming radio signals back and forth between eachother looking for resources to use for reproduction. Once a suitable reasonably sized celestial body has been located, the radion will turn all it's forward facing dishes toward the target and begin bombarding it with high intensity radiowaves. Eventually the target will melt and the radion will use powerful tractor beams to consume the material to repair itself and construct nymphs that will spread out and infest nearby asteroid fields.