Eledryll - Thirteen Mirrors

The last portal you took in the Otherworldly Vaults sent you to a small demiplane, seemingly more peaceful than the last. For once. Above your head, bizarre constellations and colorful stars you never saw before glide under the ceiling. In the center of the main chamber, a puzzling contraption towers over a sea of limitless astral void. At its heart, a large, eye-like orb continuously moves about, projecting star-like patterns on the surrounding marble walls. You turn towards your totally magical, friendly, fireball spamming wizard to ask them for an explanation. The question never left your lips. The mix of utter confusion and frantic bewilderment in their eyes had already answered it for them. It took your group four hours to deactivate the magical barrier blocking entrance to the next room. Somehow, it was even more confusing than the Void Lens already was. In an immaculate, two-storied room of azure marble, thirteen silver mirrors stood against the walls, big enough to fully reflec