Gorgeous Husk

Location guide
The Gorgeous Husk is in the topmost of the two locked rooms to the right of the Hollow Knight Fountain and requires a Simple Key to get to. The Husk is found by traveling right immediately when entering the locked room in a secret chamber. There is a hidden step, the player has to jump to get to the hidden room, so it is easy to miss.

Details
A hidden enemy in the City of Tears. When killed, the Gorgeous Husk drops 420 Geo. He can only be found in the City of Tears, and will never respawn when killed.

Although the Husk drops 420 Geo when killed it should be noted that it requires a Simple Key to access it which costs 950 Geo from Sly in Dirtmouth. Meaning purchasing the key for the purposes of finding this enemy is a net loss of 530 Geo.