As you destroyed the Time Keeper and enter High Peaks Castle biome. You started fighting the enemies, until you reach a unfamiliar room you accident went in

You see Queen sitting on a chair sipping a cup of tea, Calliope, Euterpe and Kleio where just there cleaning the place like maids. Why is a boss here and not fighting you?

Queen: oh? Why Hello there, you must be the the trouble maker who's been killing guards, yes? She sips her tea Queen: the Beheaded?

The 3 guards stare at you