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As Veronica and Ervas brought back Nidhogg and Ivy from their daily spar outside of the Kingdom, there was a special 'Undead meeting' going on in the walls within the Igni Kingdom's Castle.
This meeting was something that Ervas and Veronica had come out with for Undead to express the feelings that they often have dulled, while also trying to recall their memories through stimulation such as conversations. It was also a place where any Undead that was clueless about their true self could come to ask guidance and help, as Ervas and Veronica's main bodies couldn't be always ready to attend to any undead in need.
Since Veronica and Ervas acquired the Death Attribute Charm Skills that they had begun to call upon hundreds of Dead Spirits and because many of them desired to serve them in many ways, they ended up becoming Undead Monsters of all kinds, shapes, and forms.
Check "The Protagnist's Sister Is Actually the Strongest"!