Dark Sentinel Crystal

A Dark Sentinel Crystal is a version of the Sentinel Crystal found in the upper part of Dark Torvus in Metroid Prime 2: Echoes. It is used to monitor key spots on Dark Aether. The Luminoth found that the normal Sentinel Crystal failed in Dark Aether's atmosphere and so created a Sentinel Crystal shielded by dark energy that is more resilient to it and the attacks of its inhabitants.