Tomb of Vulom is a location added by Wyrmstooth. It is located to the west of Chillwater Mill, south of the Imperial Mining Settlement. Inside the Dragonborn will find a buried fort and a lot of dead draugr.
As the Dragonborn delves deeper into the cave they will hear a disembodied voice inviting them in. On the sarcophagus in the center of the cave, the Dragonborn will find the skull of Vulom. He will ask the Dragonborn to find the rest of his bones so that he may rest in peace. Upon returning and delivering the bones, Vulom will rise from his grave and will try to enlist the Dragonborn in his undead army.