Into the Breach
Somehow linked to The Cult and The Three, a number of crystals have been found across Wintersbreach. One was stolen from The Cult by Samuel in Mount Nord, another was being used by The Being of Light as a key to a portal in Castle Giresku (which was later taken by Abeyoueth), and another was found in Unbaraki inside a box, released from inside The Welp upon his death.
Gideon Toma performed a ritual on one of the crystals to discover that they were created in a forge of cosmic proportion, built into some unfathomable object but later shattered and scattered through the cosmos. When, by whom, and why, however are a mystery.