What to know
- The Obsidian Lathe is found inside Martyr’s Tomb in the Widow’s Overlook area.
- You need to explore the tomb, activate the nearby mechanism, and open the previously locked chamber.
- The chest contains the Obsidian Lathe and a Parasitic Stone.
- The Lathe is used at the Tarforge to improve sidearms, including ranged weapons such as the Forgotten Crossbow.
If you’re looking to strengthen your ranged combat early in Mortal Shell II, finding the Obsidian Lathe is one of the useful detours to make. The item is tucked away inside Martyr’s Tomb in Widow’s Overlook, and reaching it requires a short environmental puzzle rather than simply walking to an obvious chest.
Obsidian Lathe location at a glance
| Detail | Information |
|---|---|
| Game | Mortal Shell II |
| Item | Obsidian Lathe |
| Region | Widow’s Overlook |
| Location | Martyr’s Tomb |
| Main purpose | Sidearm upgrades |
| Other chest reward | Parasitic Stone |
| Upgrade station | Tarforge |
| Useful for | Ranged and other sidearms |
The game’s current sidearm system includes weapons such as the Forgotten Crossbow, Naylshotte, Ballistazooka and other specialized sidearms. The Obsidian Lathe is part of the upgrade path for these weapons, while the Foundry Stone is associated with material smelting at the Tarforge.

How to find the Obsidian Lathe in Widow’s Overlook
The route begins at Widow’s Overlook. You are looking for the church-like structure containing a water-filled chamber. Once you reach the building, head inside and look for the way down into Martyr’s Tomb.
How to reach Martyr’s Tomb
Step 1
Travel to Widow’s Overlook and make your way toward the large church-like structure.

Step 2
Enter the structure and look for the chamber containing water. This is the route leading down toward Martyr’s Tomb.

Step 3
Use the lift to descend into the lower part of the tomb. Once you reach the bottom, be prepared to fight the enemies in the surrounding area.

Step 4
Clear the immediate enemies before searching the room. Doing this first makes it much easier to investigate the mechanisms without being interrupted during the puzzle.

How to open the locked chamber
After reaching the lower section of Martyr’s Tomb, look for an upgrade stone and a nearby switch. The important landmark is the glowing, branch-like object in the area.
Step 5
Search around the glowing branch-like structure until you find the upgrade stone and switch.

Step 6
Interact with the switch to activate the mechanism and open the doors leading farther into the tomb.

Step 7
Move through the newly accessible chamber. There is another enemy waiting inside, so deal with it before approaching the chest.
How to get the Obsidian Lathe and Parasitic Stone
Step 8
Defeat the enemy inside the newly opened chamber. Approach the chest and open it.

Step 9
Collect the Obsidian Lathe and Parasitic Stone.
The Obsidian Lathe is the important item for this particular guide, while the Parasitic Stone provides an additional reward for making the trip. In preview gameplay, the Parasitic Stone was identified as an item capable of providing a leech-related effect, making the chest more valuable than a simple upgrade-material pickup.

Rewards from Martyr’s Tomb
| Reward | Purpose |
|---|---|
| Obsidian Lathe | Enables sidearm enhancement |
| Parasitic Stone | Provides a useful combat effect |
How to upgrade sidearms with the Obsidian Lathe
Finding the Lathe is only the first half of the process. Once you have it, return to Marrow’s Keep and make your way to the forge area.
The Tarforge is the game’s relevant upgrade location for sidearms. Current Mortal Shell II equipment information specifically identifies the Obsidian Lathe as the item used for sidearm enhancement, while the Foundry Stone handles material smelting.
Step 1
Fast travel back to Marrow’s Keep.

Step 2
Head toward the forge and locate the blacksmith or engineer responsible for weapon improvements.

Step 3
Interact with the Tarforge and select the sidearm you want to improve.

Step 4
Use the Obsidian Lathe together with the required gold and upgrade resources to perform the enhancement. Confirm the upgrade and equip the improved sidearm before heading back into the field.

The upgrade system is particularly useful if you rely heavily on ranged attacks. The Forgotten Crossbow, for example, is classified as a ranged sidearm and has its own aim, draw, reload and shot mechanics. Other sidearms fill different roles, so improving the weapon that best matches your build can make the investment more worthwhile.
Why the Obsidian Lathe matters for ranged builds
Sidearms give Mortal Shell II’s combat system another way to approach encounters. The official game description highlights sidearms and extensive upgrade options as part of the combat system, so upgrading them isn’t merely a cosmetic progression feature.
For a ranged-focused setup, getting an early upgrade can be especially useful against enemies that are dangerous to approach directly. A weapon such as the Forgotten Crossbow gives you a way to aim, draw and fire from a safer distance, while heavier sidearms can provide different forms of ranged pressure.
At the same time, you don’t necessarily need to rush straight for the Lathe if your current weapon already handles the enemies in your path comfortably. The better approach is to pick it up when you’re naturally exploring Widow’s Overlook, especially because the chest also contains the Parasitic Stone.
The Obsidian Lathe is one of the useful early items to pick up if you want stronger sidearms in Mortal Shell II. Travel through Widow’s Overlook, descend into Martyr’s Tomb, activate the mechanism near the glowing branch-like structure, and open the chest to claim the Lathe and Parasitic Stone.
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