The Celestus, is a large astronomical device of ancient origins that is hidden in Kessig's Ulvenwald on Innistrad. Built by hedgewitches centuries ago, it purpose was to track the movements of stars and the moon.
At times, it is said the arms shift about the central platform — which itself was as large as any village green. The broken rings with lenses rise from the earth, and carvings can be seen along its pitted surface. It was said that whatever purpose it once served, it was best left to the past. According to Katilda, it could be used for righting the balance of day and night.
Near the Celestus is the enclave of the Dawnhart Coven: branches and hides fashioned into tents, decorated with crescents and spheres. Floating candles, candleguides, lend the place an eerie light, as do the strange scarecrows throughout.
The Celestus was used by the Dawnhart Coven in a ritual at the Harvesttide festival. At its center was a lock of bright gold, the Sungold Lock that had to be unlocked with the Moonsilver Key first. After Arlinn Kord with the help of Teferi, Chandra Nalaar, Kaya and Adeline obtained the Key (which was in Markov Manor), they returned to Celestus. At this point Tovolar attacked the Harvesttide festival with his werewolf army. Cathars, planeswalkers and witches fought the invaders to protect the humans, while Kaya took the Key to the central area of Celestus where Katilda waited. The witches began the ritual and after the battle with Tovolar was over and he and his army retreated, Arlinn went to Katilda to help finish the ritual. But Olivia Voldaren appeared and interrupted the ritual by taking the Key with her.
With Sorin Markov's assistance, Arlinn and the Gatewatch raided Olivia's wedding with Edgar Markov. Aided by Sigarda and Katilda's spirit they managed to recover the Key. They hastened their return to the Celestus to complete the ritual. When the Moonsilver Key and the Sungold Lock were joined, a flash of light flooded the Celestus. It was warm as sunlight, and the Celestus roared to life, shaking off centuries of overgrowth. With each passing of the arms, the light increased in intensity. Eventually only a single column remained, running from the Celestus to the moon itself. When the light faded, the moon already had begun her descent. The balance between night and day was thus restored.
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- K. Arsenault Rivera (September 2, 2021). "Episode 1: The Witch in the Woods". magicthegathering.com. Wizards of the Coast.
- Doug Beyer and Ari Zirulnik (September 9, 2021). "Planeswalker's Guide to Innistrad: Midnight Hunt". magicthegathering.com. Wizards of the Coast.
- Prepare for the Harvesttide Festival – Innistrad: Midnight Hunt (Video). Magic: The Gathering. YouTube (September 2, 2021).
- K. Arsenault Rivera (September 15, 2021). "Episode 3: The Fall of the House of Betzold". magicthegathering.com. Wizards of the Coast.
- K. Arsenault Rivera (September 22, 2021). "Episode 4: Harvestide". magicthegathering.com. Wizards of the Coast.
- K. Arsenault Rivera (September 29, 2021). "Episode 5: Night Closes 'Round". magicthegathering.com. Wizards of the Coast.
- K. Arsenault Rivera (November 24, 2021). "Episode 5: Till Death Do Us Part". magicthegathering.com. Wizards of the Coast.