This story is a sequel to I Love Being a Rainboom

Triceraton scientist named Harzona was living in the Triceraton Homeworld during the old rule. When the homeworld was being destroyed, he and his team tried to escape using a science ship. But when it failed, they decided to use a one-Triceraton inter-dimensional escape shuttle that doubles as a lab. Reluctantly, he boarded. He promised his team he'd never let hatred rule him. His original plan was to meet up with the Utrom, in hopes of finding a new homeworld for survivors. But the inter-dimensional navigation system was damage and he crashed on a Starswirl the Bearded era Equestria. As his ship plummeted, he slipped into a stasis chamber to survive the crash.

Credit for the idea goes to Darth Wrex