That could go back to Ricther using blood magic on the dead and the dying Orcs as well. Like nearly all of his writings Aleron left that epilogue open.
Also being covered in blood and gore with giant club and silver gauntlet plus looking like a hulk and surrounded by Two worms, golem, spider and saproling... after magic show seems epic.
Richter will do so much more for all the dead bodies in the cavern hohoho... I hope orcs have stamina fortification potions ;DD Harvest!!!
to increase his little army he could also zombify some of those dead bodies. not sure how that would work with ghost harvest...can you use ghost harvest on a ghost?