CakeorDeath07
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Sunny having the key might confirm that he is the mad prince because in the last chapter it was said that the 6 plagues were also sometimes referred to as the heralds of the esctuary. If that is the case then Kai, Effie, Cassie, Jet, and Mordret will also have a key, and we just haven’t seen the other keys because Sunny has only met up with Neph who didn’t get one because she can’t be corrupted.