Assarnatamat is a Daedric ruin dedicated to Mehrunes Dagon in the West Gash region of Vvardenfell. A group of bandits is holed up here, and the interior of the shrine is inaccessible. It is not marked on the map, but it is one of the locations you need to visit for the Daedric Explorer achievement. A heavy sack and a thieves trove can spawn here. There are two fetcherfly nests by the road. A chest can spawn on the highest pavilion (where the door is), behind a pillar to the right of the banner situated to the right of the door.