Board Thread:General Discussion/@comment-6192846-20150304021219/@comment-6986530-20150306003731

It could also be that she's been possessed by the mask ala Jack of Blades.

Like if the Mask is the true Master of the Hellish Yard and turns whoever wears it into the next Master--Suppose Nemesis wore it during the Civil War and that was why she was perceived as the Master of the Hellish Yard and later came to believe herself as such, then suppose Gumillia puts it on and becomes the Master we see here.