Kell Echo

The Kell Echo is the final boss of the Prophecy dungeon, from Season of Arrivals. It is a Taken Echo of a Fallen Kell created by the Nine, built to show Guardians that combining Light and Darkness is necessary to survive the Black Fleet.

The fight starts with three copies of the Echo in the corners of the arena, all immune to damage. Collecting motes from Taken Knights lets players disable the energy pillar beside a copy; that copy then leaves and a Taken Ogre appears, which must be defeated quickly. Once all three copies are gone, a central teleport moves the team to a second arena for the damage phase.

In the damage phase the Echo has a protective field that blocks Dark Entropy buildup, and its modified Darkness Bolt teleports players back while applying Dark Entropy. Staying close to the boss keeps the debuff low, and avoiding its wave attack helps. Its attacks and Taken support make the phase hectic.

Many players read the Echo as foreshadowing Eramis and Stasis; it is also described as a precursor to the Stasis storyline of Beyond Light. The related activity is Darkest Before.