Thanos gave Nebula and Gamora a mission to obtain the Orb, inside one of the Cloud Tombs of Praxius; Nebula went in without waiting for Gamora and and nearly fell victim to the Tombs' defense system. She drilled into the Cloud Tombs, expecting to find the Orb. Instead, she became ensnared by an impenetrable Laser Thorn Energy Net. Nebula found herself at the mercy of the inhabitants and was rescued by Gamora. Thanos ordered Gamora to leave Nebula alone to escape on her own, which she did by cutting her own arm off in order to escape the net.
- As the Cloud Tombs of Praxius float on Praxius IX, the planet could either have a solid surface or be a Gas giant.