Ego's Ship was the ship used by Ego the Living Planet and Mantis to travel across the galaxy.
To be added.
Destroying the Sovereign Fleet
Transporting the Guardians of the Galaxy
After landing on the planet Berhert, Ego left the ship and introduced himself to the Guardians. The next day the ship left the planet with Star-Lord, Gamora and Drax the Destroyer as passengers. Ego's ward Mantis put Ego to sleep for the journey to Ego's planet. Mantis then demonstrated her powers to the Guardians.
When the ship landed onto Ego's Planet, the passengers exited the craft.
When the planet disintegrated, the ship was supposedly was destroyed as well.