Dirtmouth is the first town that can be visited, located in the valley between the Howling Cliffs and Crystal Peak. It initially has only one resident, but depending on certain events, more bugs can move into town.
The valley town of Dirtmouth is located right below the ruins of the kingdom of Hallownest. It is almost entirely abandoned, with many of the houses boarded up and empty. Elderbug is the oldest bug in town and the only remaining resident. Bretta and Sly, two of the missing residents, return to town if they are rescued, with Sly resuming his job as Dirtmouth's shopkeep.
Besides a shop, Dirtmouth also has a Stag Station which can be used once any other Stag Station around Hallownest has been reopened. Iselda opens a map shop next to the Stag Station when a Map has been purchased or False Knight has been defeated.
To the east of town is a graveyard which leads to a cave which is closed by a stone door, requiring a Simple Key to open. Confessor Jiji can be found here in normal mode, or Steel Soul Jinn in Steel Soul Mode. A lift next to this cave goes up to Crystal Peak.
West of the town of Dirtmouth is King's Pass, which is where the Knight starts their journey into Hallownest.
Dirtmouth used to be a bustling town which was part of the kingdom of Hallownest, being a respite for travellers to and from the kingdom. A bridge which ran up to King's Pass allowed for easy access into the town. Dirtmouth's Stag Station brought travellers to other places around the kingdom.
Once the Infection spread across Hallownest, all entry points into the kingdom were sealed to prevent the spread of the Infection, even the Stag Station shutting down. Dirtmouth's old well remained as the only way to enter Hallownest. Over the years, this well was used by many wanderers and adventurers to get into the ruins of the kingdom, with few of them ever returning. When the bridge up to King's Pass crumbled away, the few travellers coming to Dirtmouth had to take circuitous routes around the cliffs.
Over time, nearly everyone living in Dirtmouth went down the well, drawn in one by one by the promise of wealth, glory, or enlightenment. The town fell quiet, with none of the residents ever returning from the ruins of Hallownest.
How to access
The initial way to access Dirtmouth is from King's Pass, after breaking down the door at the very end of the area.
Sub-area: King's Pass
King's Pass is a set of desolate tunnels located to the west of Dirtmouth which used to be the main entryway into Hallownest. The caverns are covered with fossilised shells in the background and contain glowing lore tablets throughout the area. At the far east is a large sealed door that must be broken open to access Dirtmouth and the rest of Hallownest.
The Grimm Troupe's Tents
After the Grimm Troupe's Quest has been started, two large tents will appear in Dirtmouth, shocking its inhabitants. The smaller tent is home to Divine, who can turn Leg Eater's Fragile Charms into unbreakable ones, for a large amount of Geo.
The larger tent contains a grand stage in which Grimm offers the Knight a charm, Grimmchild. This tent also hosts Grimm's fight. After this fight and once all flames have been collected, an area to the right of the stage opens up. At the end of a long corridor, Grimm can be found sleeping. With the Grimmchild equipped he can be dreamnailed in order to start the Nightmare King Grimm battle.
The eastern corridor of Grimm's Tent also contains a passage leading to a secret room. It can be accessed by climbing up the second arch from the left. The secret room has several inaccessible chests, the masks of the Grimmkin, and an unknown device in the middle. If a Spell is used in this room, a red barrier lights up.