Awaria and... The UndeathTaker (Awaria/Helltaker x male necromancer reader)

(y/n) (l/n) aka the Undeathtaker and son of Helltaker. He is a powerful necromancer and even eventually gotten an harem full of hot undead with a few living monster girls. However, it's not just his father's demon harem that got him into having a harem of his own. He also gotten a... unique job that only someone of his... expertise can do from a private organization called Awaria. The job involves making some improvements to machines to... keep the paranormal in check more specifically... ghosts and spirits in haunted maintenance tunnels full of them. He would also be working with a new tunnel runner named Ula Usterka to help him get used to the place and to start his work. What will his job be like? How will undead spirits react to a tunnel runner with a necromancer? Is there more than just work or money purposes for taking this job?