Cyn was a major antagonist who served as the final antagonist of Murder Drones.

She was a Worker Drone who was improperly disposed of, resulting in the Absolute Solver mutating inside her and using her body as its own. Under the Solver's influence, Cyn was responsible for many major events in Murder Drones, from the Elliott Manor massacre to the deployment of Disassembly Drones to Copper 9. Following the massacre and melding the deceased Tessa's skin over herself, Cyn proceeded to reconstruct N, J, V and other Worker Drone servants of the manor into her own "murder pets" that she unleashed on humanity that ultimately led to the destruction of Earth.

After spreading to the other human exoplanets by taking over other Drones who possess the powers of the Solver, she would destroy each planet one-by-one until finally coming to Copper 9. However, due to the intervention of Yeva and Nori, she failed to initiate a total core collapse and in order to finish the job, had to go to the planet directly. To accomplish this, Cyn reprogrammed the Disassembly Drones into hunting Worker Drones instead of humans and under the lie that the company sent them, which culminated in her arriving under Tessa's facade to deal with the remaining Solver hosts, Doll and Uzi, to prevent anyone else from stopping her consumption of the planet.

She met her end at the hands of Uzi after she destroyed Cyn's heart and devoured her singularity core, causing the merged form of Tessa's skin and Cyn's body to melt apart and for Uzi to become the Solver's new main host.