Beast

The third Dreamer, required to reach the Hollow Knight. Herrah the Beast rests in the Beast's Den, deep in Deepnest; you need the Dream Nail to claim her, and reaching her means picking your way through Deepnest's dark, spider-infested tunnels to her chamber, then Dream Nailing her to lift the seal. With all three Dreamers gone (Teacher, Watcher), the Black Egg Temple opens.