The World of Vanis

Deep beneath the city of Shallowshill, lies a forgotten catacomb once used by the city's old nobility to bury their dead. Eventually, it became the grave of the nobles during the the Northguard War when Lurg'bosh of Orcish Army's regiment managed to circle around the forest and attack from the south. No one knows what happened in the catacombs except that the entrances to the tombs were collapsed after nobles and soldiers led the orcs down there. When miners finally got past the debris a few years later, they found that some of the sections of the catacombs were locked and several dead bodies were found in some rooms, both men and orc. The men were given proper burials within the catacombs while the orcs were burned to ash. What led to the entrances being seal once more was that one day, mysterious happenings were occuring within the tombs, bodies of the commoner's deceased went missing, guards would vanish without a trace, and ghostly whispers would occur. What could be happening?