Talk:Overlord Volume 12/@comment-45.33.140.149-20170929143448/@comment-70.24.71.173-20171002141539

Simple it tests the population AND allows him to show the world that he is such a powerful undead that he can ressurect himself proving that even if you DO kill him he can come back and (possably) even stronger. That kind of effect can really cement your rule over an area.