Cadeath could be what happens when an elf steeps their soul in too much of the jade wind.
Or maybe it's because she's the Vicereine. Maybe being a viceroy/vicereine of Laurelorn is more than a political appointment, but actually a magical-spiritual one instead and she has to be "connected" to the land she governs somehow?
Maybe she's a dryad hivemind puppeting an elven shell.
We don't really know what she is, but she is an "ambassador for both Eonir and Laurelorn", implying that those are separate entities, and that she's familiar enough with both to be chosen to represent them.
Huh, depending on which she feels she belongs to, she might have some divided loyalties herself.
Hm, Eonir politics are beginning to sound complex. We have Viceroys (Cadeath calls herself the vicereine of the city of Oldenlitz, implying there might be other viceroys of other locations), we have the grey lords who never leave their tower, we have Laurelorn itself as a possible faction, we know the isolationist faction lost their ruling family to beastmen recently (elf recently or human recently?).