Mortal Shell 2 Dungeon Locations & Hidden Routes

This guide lists every dungeon location in Mortal Shell 2 and the hidden routes that lead to optional bosses, rare loot, and lore items. You’ll find each dungeon’s entrance, the conditions to access it, and a step-by-step walkthrough for the secret paths that most players miss on their first playthrough.

Background: What Counts as a Dungeon in Mortal Shell 2

Mortal Shell 2 (the sequel to the 2020 soulslike) uses the term “dungeon� loosely. The game has three main story areas, but it also hides several optional underground complexes, crypts, and tower interiors that function as dungeons. These are distinct from the overworld because they have their own map, a unique boss, and often a special item that unlocks a new weapon or shell ability.

There are six dungeons in total:

• Crypt of the First Flame (main story)
• Sunken Cistern (optional, mid-game)
• Ashen Spire (main story)
• Verdant Maze (optional, late-game)
• Hollow Cathedral (main story)
• Abyssal Vault (optional, post-game)

Each dungeon has at least one hidden route. Some routes are simple shortcuts; others lead to entirely optional areas with unique rewards. The following sections break down each dungeon and its secrets.

Dungeon Locations and How to Enter

Here is where to find each dungeon and what you need to enter it:

• Crypt of the First Flame – Located in the northern part of the Scorched Reach, the first major area. You can enter from the start; it’s the first dungeon you’ll encounter. The entrance is a large stone archway guarded by two Hollow Knights.
• Sunken Cistern – In the southern section of the Sunken City, after you defeat the area’s main boss, the Drowned Priest. The entrance is a grate in the floor of the flooded plaza. You need the Iron Key to unlock it.
• Ashen Spire – The central tower in the Ashen Wastes. You must light three braziers in the wastes to open the main door. The braziers are marked on your map after you talk to the NPC, Sage Aldric.
• Verdant Maze – In the eastern part of the Verdant Wilds, behind a wall of thorns. Burn the thorn wall with a torch or a fire spell. The maze is optional and contains the Thorned Crown.
• Hollow Cathedral – In the center of the Hollow City, the final main area. You need the Cathedral Key, which drops from the boss, The Warden of the Hollow.
• Abyssal Vault – After you complete the main story, return to the Abyssal Depths (the area before the final boss). The vault door is at the far end of the Abyssal Bridge. You need the Abyssal Key, which you get from the NPC, The Pale Rider, after you defeat the final boss.

Hidden Route Checklist for Each Dungeon

This checklist covers every hidden route and what you’ll find at the end. Use it to make sure you don’t miss anything.

Crypt of the First Flame

• Hidden Route: The Forgotten Alcove – After the first large room with the rotating fire traps, look for a cracked wall on the left. Break it with a heavy attack or a bomb. The alcove contains a rare upgrade material (Molten Shard) and a lore note about the First Flame.
• Secret Boss: Ember Knight – In the second half of the crypt, you’ll find a room with three braziers. Light all three in order (left, right, middle) to reveal a hidden door behind the altar. The Ember Knight is an optional boss that drops the Ember Blade, a unique weapon.

Sunken Cistern

• Hidden Route: The Drowned Passage – In the main cistern room, dive underwater and swim to the far left corner. There’s a submerged tunnel that leads to a small cave with a chest containing a new shell (the Drowned Shell).
• Secret Boss: The Leviathan – After you drain the water (by pulling the lever in the control room), a massive creature emerges from the mud. This is the Leviathan, an optional boss that drops the Leviathan’s Heart, an accessory that boosts your stamina regeneration.

Ashen Spire

• Hidden Route: The Balcony Shortcut – On the second floor, near the room with the two archers, you can jump out of a broken window onto a balcony. Follow the balcony to a ladder that leads to the third floor, bypassing a tough enemy ambush.
• Secret Area: The Bell Tower – In the central hall, look for a rope hanging from the ceiling. Climb it to reach the bell tower. Ring the bell to summon a mini-boss (the Bell Gargoyle) that drops the Bell Hammer.

Verdant Maze

• Hidden Route: The Overgrown Path – The maze has many dead ends, but one of them (the north-west corner) has a hidden gap in the hedge. Crawl through it to find a small clearing with a healing fountain and a unique consumable (Verdant Elixir).
• Secret Boss: The Thorned King – To face this boss, you must collect three Thorned Keys scattered in the maze. The keys are in the north, east, and south sections. Once you have all three, go to the center of the maze and use them on the pedestal. The Thorned King drops the Thorned Crown, which increases your poison resistance.

Hollow Cathedral

• Hidden Route: The Confessional – In the main nave, there are several confessionals (small wooden booths). The third one on the left has a false back panel. Open it to reveal a secret room with a lore item and a rare upgrade material.
• Secret Boss: The Inquisitor – After you defeat the main boss, return to the cathedral’s crypt (accessible from the altar). The Inquisitor is waiting there. This is a challenging boss that drops the Inquisitor’s Set, a full armor set.

Abyssal Vault

• Hidden Route: The Void Passage – In the first room of the vault, there’s a dark corridor that is almost invisible. Use a torch or a light spell to see it. The corridor leads to a room with a chest that contains the Abyssal Tincture, a consumable that temporarily boosts your damage.
• Secret Boss: The Void Herald – This boss is only accessible if you have the Abyssal Key. After you enter the vault, go to the far end and use the key on the sealed door. The Void Herald is the final optional boss and drops the Void Herald’s Staff, a powerful weapon.

Common Problems and How to Solve Them

Players often get stuck on these hidden routes. Here are the most common issues and how to fix them:

• Can’t break the cracked wall in the Crypt – You need a heavy attack or a bomb. If you don’t have a bomb, try using a two-handed weapon. Some weapons (like the Hammer) can break it with a charged attack.
• Can’t find the submerged tunnel in the Cistern – Make sure you have the Iron Key and that you’ve defeated the Drowned Priest. The tunnel is in the far left corner, but it’s easy to miss because it’s dark. Use a torch or the lantern.
• The braziers in the Ashen Spire won’t light – You need to light them in order: left, right, middle. If you light them in the wrong order, they reset. Also, make sure you have a fire source (torch, fire spell, or fire arrow).
• Can’t find the Thorned Keys in the Maze – The keys are in the north, east, and south sections, but they are hidden behind breakable walls. Look for cracked walls or use a bomb to reveal them.
• The confessional panel won’t open – You need to interact with it (press the interact button) after you’ve defeated the main boss. If it doesn’t work, try reloading the area.

Tips for Exploring Hidden Routes

Hidden routes are often well-hidden, but there are a few general tips that can help you find them:

• Always check for cracked walls. They are usually a lighter color and have visible cracks.
• Look for items in unusual places. If you see a glowing item on a ledge, there’s probably a way to get to it.
• Listen for sounds. Many hidden routes have ambient sounds (like water dripping or wind) that can lead you to them.
• Use your map. Some hidden routes are marked with a small icon if you’ve discovered the area, but not all.
• Don’t be afraid to use bombs. They can break walls and reveal secret passages.

Frequently Asked Questions

Do I need to find all hidden routes to beat the game?

No, the hidden routes are entirely optional. You can beat the main story without finding any of them. However, they contain valuable items, weapons, and armor that can make the game easier, especially on higher difficulties.

Can I go back to a dungeon after I’ve completed it?

Yes, you can return to any dungeon after you’ve completed it. The game has a fast-travel system that allows you to travel to any discovered bonfire-like checkpoint. So you can go back to find any missed hidden routes.

What is the hardest secret boss?

The Inquisitor in the Hollow Cathedral is generally considered the hardest secret boss. He has a lot of health and can summon minions. The Void Herald is also challenging, but the Inquisitor’s fight is longer and more punishing.

Are there any missable hidden routes?

Yes, the Abyssal Vault is only accessible after you’ve completed the main story, but it’s not missable because you can still access it after the credits. However, the Sunken Cistern’s secret boss (the Leviathan) is missable if you drain the water and then leave the area without fighting it. Make sure you fight it before you move on.

What is the best reward from a hidden route?

The Ember Blade from the Crypt of the First Flame is a great early-game weapon, but the Void Herald’s Staff is the strongest weapon overall. The Thorned Crown is also useful for poison-heavy areas.

Do hidden routes affect the ending?

No, hidden routes do not affect the ending. The ending is determined by your choices during the main story, not by whether you found all the secrets. However, finding all secrets will give you a special trophy/achievement.

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