Howling Cliffs

A grotto filled with blue butterflies east of where Cornifer is located. After some platforming, the ghost of Joni can be found near an altar. It is here that the Joni's Blessing Charm can be obtained.

The platforming leading up to Joni's Repose is pitch black and can be illuminated with the Lumafly Lantern.

Sub-area: Stag Nest

The birthplace of The Last Stag, and all other Stags in Hallownest, reachable only through unlocking every other available Stag Station. Littered with Stag corpses, but also one freshly hatched egg, signalling the hope for Stags to live on.

Special rooms

Nightmare Lantern Chamber This room serves two purposes, both revolving around the Grimm Troupe. This room allows for summoning the Grimm Troupe into Dirtmouth and accessing the content pack. This room also serves the second purpose of being able to banish the Grimm Troupe from Hallownest and complete the content pack's alternative ending.

Achievements

Trivia
 * This is the area the Knight is seen traversing through in the opening cutscene. The ledge with a lamppost that the Knight jumps from at the end of the cutscene can be found in the northeast part of the Howling Cliffs.
 * It is possible to reach Stag Nest by having the Monarch Wings and luring 1-2 Vengeflies to Nail-bounce on to reach the ledge.
 * The northeast part of the Howling Cliffs connects to King's Pass when jumping off the ledge, but using Crystal Heart instead skips King's Pass and makes the Knight end up directly in Dirtmouth.
 * Due to a glitch with the physics, if the map is pulled out while being pushed by the wind, the Knight is pushed faster.

References

Воющие утёсы Acantilados_Aulladores Penhascos Uivantes Wyjące Klify