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Defeat the Infested Miner at the end of Burrowkin Dwelling to get Wretchcaller’s Stone. The dungeon is reached from the Gate of Mammon Beacon in the Ruins of Mammon. The stone spends Resolve to infuse a compatible melee weapon with Trauma; guides report that tempering it extends the effect from four strikes to eight, then makes it permanent.
Where to find Wretchcaller’s Stone
Guides identify the Infested Miner, the boss at the end of Burrowkin Dwelling, as the source of Wretchcaller’s Stone. Reach the dungeon from the Gate of Mammon Beacon in the Ruins of Mammon. The reported route is:
- At the beacon, look for a nearby house and find the lever inside.
- Use the lever to operate the elevator into Burrowkin Dwelling.
- Fight through the dungeon to its end and defeat the Infested Miner. Guides report the stone as the reward.
This location and reward are reported by NerdsChalk and Game8; the official game site does not provide an item-specific route.
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What Wretchcaller’s Stone does
The item database describes its effect as: “Spend Resolve to infuse your Weapon with Trauma.” The listed compatible weapon is the Obsidian Hammer. A guide reports that activating the infusion costs 30 Resolve, but that number is guide-reported rather than established in official item documentation; check the current game build for the cost.
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Guides describe the stone’s tempering progression as follows:
| Tempering level | Reported effect | Evidence |
|---|---|---|
| 1 | Activate the Trauma infusion by spending 30 Resolve. | NerdsChalk guide report; the item database confirms the Resolve-based effect but does not state this numeric cost. |
| 2 | Infusion lasts for 4 strikes. | Guide-reported; earlier-rank strike counts are not stated in the item database. |
| 3 | Infusion lasts for 8 strikes. | Guide-reported; earlier-rank strike counts are not stated in the item database. |
| 4 | Infusion becomes permanent. | Reported by guides and confirmed as the final effect by the item database. |
The numeric cost and intermediate strike counts come from third-party guides, not official game documentation. The item database independently confirms the permanent final effect.
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How to upgrade the stone
Guides describe a three-part process involving the Etching Needle, experience earned while the stone is equipped, and Franz at Marrow Keep:
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- Equip Wretchcaller’s Stone while defeating enemies so it gains experience.
- Return to Franz at Marrow Keep and pay Coin to temper the stone. A second guide refers to Franz’s location as the Tarforge.
The sources do not establish reliable, cross-verified Coin costs or experience thresholds, so those values should not be assumed from one guide or applied to every current game build. The item-specific location, effects, and upgrade loop are guide and database reports; the official Mortal Shell II site does not document these mechanics.
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