This page contains information regarding Star Trek: Prodigy, and thus may contain spoilers.
The Cymari homeworld was an inhabited desert planet in the Skeralyx system. It was the homeworld of the Cymari, an advanced non-corporeal species that utilized cymatic transmutation to create structures from the sand on the planet's surface.
At the urging of DaiMon Nandi, in 2383 the crew of the USS Protostar visited the Cymari homeworld to engage in a "diplomatic exchange". However, Nandi's only interest was in acquiring a remalite crystal from the natives by whatever means. (PRO: "First Con-tact")