Ensemble's Refrain
The Atheon challenge is completed when no player in a portal destroys more than one Oracle per wave. Destroying the same Oracle more than once does not affect the challenge.
Atheon spawns on the spot where the final Conflux used to be. It does not move too far from that area, and is shielded from all damage. After a while, Atheon opens the timestreams and teleports three random Guardians into one of the portals, with the Aegis right in front of them and a Gatekeeper waiting below. Then, Atheon calls upon the Oracles. Their sequence can be seen only from the main room. They can be destroyed only in a portal.
The teleported players have to kill the Gatekeeper and tell the rest of their team which portal to keep open for them. Every player in a portal is Marked by the Void, which gradually covers their screen in black, preventing them from seeing anything. Someone should pick up the Aegis and use its Guard ability to cleanse themself and nearby players from the mark. The mark is reapplied instantly until the players cleanse in the main area.
Players in the main area have to survive against a swarm of Supplicants, exploding Harpies, open the portal for their teammates, and tell the portal team the correct Oracle sequence. Once three waves with three Oracles in each are destroyed, all players receive the Time's Vengeance buff, which lasts for 30 seconds and allows them to damage Atheon. The portal team can come back into the main area for the damage phase. The Aegis remains in the fireteam's possession until the damage phase ends, and has to be held by someone to prevent a wipe.
Atheon uses the Force Cage while it is unshielded. A random player will get the 5 second debuff called Imminent Detain. After it expires, that person and everyone around them are detained and die once the timer runs out. The about to be detained player has to split from the group to let their teammates shoot them out of the cage.
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