History of Cosmic Equilibrium

Cosmic Equilibrium is the Master difficulty challenge for the third encounter (Macrocosm) of the Root of Nightmares raid, fought against Zo'Aurc.

How to complete

1. Defeat the yellow-bar Colossus enemies to obtain the Planetary Insight buff, which lets you see planet placements.
2. Reverse the normal strategy: all Dark planets must end on the left side of the room and all Light planets on the right.
3. Grab a planet matching your current side and swap it with the opposite-type planet a teammate on the other side is holding.
4. Repeat until every planet is on its correct side. Mixed sides (for example two Dark and one Light) cause a wipe and a "Challenge Failed" message.
5. Then run the normal damage phase.
6. Master note: the Colossus is replaced by four Anti-Barrier Colossus, so bring something like Arbalest.

Kyber's Corner describes the challenge differently (node activations on Nezarec); that appears to be a different encounter or outdated, and I did not rely on it.

Rewards

Extra raid loot including the Adept version of Rufus's Fury (per Keengamer-style summary from GameRant) and a higher chance for Conditional Finality (per a search summary of light.gg, unopened). Counts toward the Dream Warrior seal per GameRant.