Bloodstained: Ritual of the Night/Dead Lands

Dead Lands is a hidden area that is a Kingdom Crossover promotion of Kingdom: Two Crowns. It has the pixel art style of Kingdom. To reach it, you first need to have already defeated Bathin. Then purchase the Crown of Creation from the shop. When you equip the crown, an icon will appear on the map in Bridge of Evil where you board the train. Ride the train and when you get off you will arrive in Dead Lands.

There are two Gamigins and a Breeder that spawns Greedlings. Once the Breeder is defeated, it will drop the Familiar: Archer shard and Miriam will immediately leave the area. Both of the new enemies will not show up in the Demons menu in the Archives menu.