This is the final battle in the final Metroid Prime title, Metroid Prime 3: Corruption. Dark Samus clones itself repeatedly in this battle and works together with its clones (or "echoes") in many interesting ways. In a lot of ways, this encounter represents a culmination of many things I had been working toward since the original Dark Samus battle in Metroid Prime 2. I wanted Helios to defy easy understanding by continually morphing and changing in ways that deny the player any easy categorization of its identity.