From Season 4 Episode 6 Mystery Breakdown: Are the New Town Theories Actually True?
For three seasons, the inscribed stone talismans Boyd discovered in the hollow tree provided absolute sanctuary. Hang one near an enclosed threshold, and the monsters stay outside. That ironclad rule fractured in Episode 6.
During a harrowing sequence in the lower quarters of Colony House, a talisman fails to seal a back pantry entrance despite being properly mounted on the frame. The resulting chaos leaves two dead and shatters the community's primary source of security. Boyd's investigation reveals that the structural integrity of the building itself had warped: the frame shifted due to seismic disturbances from the root cellar, breaking the geometric enclosure required for the stone to function.
This technical breakdown reframes the talismans completely. They are not magical charms with limitless power. They require strict environmental conditions to channel whatever shielding frequency keeps the predators at bay. With the town's geology warping and foundation beams cracking across multiple properties, the safe houses are turning into wooden coffins.