User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-2603:3020:B0F:6700:ECA7:7FB3:AEF7:83FF-20180525140657/@comment-30924344-20180525163643

In the Prose Edda book Gylfaginning, Hel is described as having been appointed by the god Odin as ruler of a realm of the same name, located in Niflheim. So really, Ishi just made her ruler of not just Helheim (Hel), but all of Niflheim.