If the Hero sleeps in the Moslin's Inn for a long enough period of time, they will be awaken from their sleep and attacked by a Hackdirt Brethren.
If the Hero is unlucky, the Brethren will climb up a trapdoor in one of the houses and chase them away from the village. If they don't kill them, they'll keep chasing them farther away, even to other regions.
There are a lot of bones lying in the cell down in the cave, which probably means Dar-Ma is not the first to fall victim for the Brethren.
The Brethren are made to resemble the people of Innsmouth from the H.P. Lovecraft story The Shadow Over Innsmouth. This is a tie in to the Oblivion quest "A Shadow over Hackdirt."