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After Curse breaks the curse and gains all these new abilities, one of the abilities allows him to choose people that can represent him. he doesn't know how far this extends but currently he needs someone to keep the affairs on the Island in check.
Aside from Lady Illo, there is no one qualified enough to do that. So she told her and the elders and without even the slightest objection, Karsha used the Ability on her.
'Empress' Karsha didn't hesitate to bestow on her the title Empress. He always referred to her Mom as Empress so seeing a carbon copy of her made him remember his mom.
But aside from that, he also knew there was an Inner and Core area of the island, but he didn't know what he would find there. He is certain ones he breaks the curse, they will also go through the same transition as the Outer area.