Facet of Justice

To find Facet of Justice, load into patrol at The Landing and continue through The Refraction until you reach the room shown below. You should see a locked prismatic chest in the center of the room, as well as a solar crystal in front of the top window. In the upper portion of the room, there are ten places where you can dunk this crystal.

After picking the crystal up, look toward the center of the room while staying on the top floor—you should see symbols appear in front of all the deposit locations. Dunk the crystal in the places that correspond with the stack of three symbols in the center of the room. If done correctly, this will spawn a wave of enemies, eventually leading to a boss enemy that drops the key to the chest.