Cell: 1,-37 Large Daedric shrine dedicated to Mephala. The upper levels should have some cultists near the shrine with low-level loot. As the player descends to the lower levels, they should face increasingly powerful daedra (e.g. dridea) who guard valuable treasures inside.
Quest summary: A NPC currently residing somewhere in Othrano managed to get a hold of one of Sotha Sil's time-keeping devices. They've messed with it to the point they were able to turn back time for an hour, but with the result they are now stuck in a time loop, reliving the same hour over and over again.
This is an aura effect, not tied to the location but the NPC and those he interacts with.
Othmura has a relatively long stretch of the Thirr River with a road running alongside it, which needs to be rerouted at Othrano and the town of Othmura.
Othmura would be located on a bluff overlooking the Thirr, the street descending on the south side to the docks.