Well of Darkness

This article contains spoilers for the following products: Phantom Phenomena
From PathfinderWiki

The Well of Darkness is a morlock-infested Kellid ruin beneath an ancient monolith in Versex, near the village of Dunhob. The monolith itself holds significant psychic power. Tales of Ustalavic nobles fleeing into the well to escape the Whispering Tyrant persist among superstitious locals, who believe that sprinkling iron shavings near the monolith forces the evil creatures within to stop to count them before giving chase.[1]