You’re gonna need to look the part to enter Undying Shores
Before you can master the Fatal Falls DLC levels in Dead Cells, you’ll need to reach them. Here’s a quick, no-nonsense guide on where they slot into the progression route and how to access them.
Once Fatal Falls is installed (you can verify this from the DLC listing on the main menu), you can start a Dead Cells run like normal from the Prisoners’ Quarters. The first of the three DLC levels is called Fractured Shrines, and it’s accessible right after Black Bridge (Concierge) or The Nest (Mama Tick).
Here’s the door to Fractured Shrines after clearing Black Bridge and taking the elevator up.
You can take Fractured Shrines to the second Fatal Falls DLC level, Undying Shores. But before you can do that, you’ll need to unlock a door at the end of the area guarded by spear-holding statues.
The door to Undying Shores is locked by default – you’ll need a costume to get inside.
While you’re carving a path through Fractured Shrines, be on the lookout for a dead cultist. Here’s one.
The cultist corpse is easy to miss if you don’t know what you’re looking for.
Using your possession ability (clicking in the right stick on a gamepad), you can “leave your body” and take over the cultist, resulting in a change of clothes. You should see a text-based prompt.
The first time you steal the cultist outfit, you’ll see a little cutscene. That’s all you need.
Head back to the Undying Shores entrance with the cultist garb and it’ll open up.
The path from Undying Shores to The Mausoleum is straightforward. Here’s what you’re looking for.
This third and final level of Fatal Falls is a boss fight (Scarecrow), and if you win, you’ll be able to exit to either High Peak Castle or Derelict Distillery and continue your run as you normally would.
According to the Dead Cells developers, once you beat Scarecrow, you’ll be able to reach The Mausoleum from Undying Shores or Cavern on future runs – but I haven’t tried the latter method yet.
If you need a visual aid, consult the Dead Cells wiki biome map. I’m sure it’ll be updated soon.