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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 weapon with Trauma; guides report that upgrading it extends the effect from four strikes to eight, then makes it permanent.
Where to find Wretchcaller’s Stone
Guides identify the Infested Miner as the source of Wretchcaller’s Stone. To reach the boss, start at the Gate of Mammon Beacon in the Ruins of Mammon and look for a nearby house with a lever. The lever operates an elevator into Burrowkin Dwelling. Fight through the dungeon to reach the Infested Miner; defeating it is reported to award the stone.
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This route and reward are reported by third-party guides rather than official item-specific documentation. The available sources do not establish whether the drop changes by platform or game version. NerdsChalk’s Wretchcaller’s Stone guide and Gamepur’s guide both point to the Infested Miner.
What the stone does and which weapon it fits
Wretchcaller’s Stone is a melee Infusion Tarstone. Its item-reference description is: “Spend Resolve to infuse your Weapon with Trauma.” The reference lists the Obsidian Hammer as a compatible weapon, making it a specific option if you want to apply the effect to that weapon. The item reference and NerdsChalk’s guide describe the infusion.
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NerdsChalk reports an activation cost of 30 Resolve. Treat that as a guide-reported value, not a confirmed universal cost: the available sources do not establish whether it varies by build or patch. Check the cost shown in your current game before activating the infusion.
How tempering changes the infusion
Guides report this tempering progression for Wretchcaller’s Stone:
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| Tempering level | Reported effect |
|---|---|
| Level 1 | Activate the Trauma infusion by spending 30 Resolve, according to NerdsChalk. |
| Level 2 | The infusion lasts for 4 strikes, according to NerdsChalk. |
| Level 3 | The infusion lasts for 8 strikes, according to NerdsChalk. |
| Level 4 | The infusion becomes permanent. NerdsChalk reports this endpoint; the item reference also records the permanent effect but does not list the earlier strike counts. |
The intermediate durations and activation cost are guide-reported figures, not independently documented in official item notes. NerdsChalk’s guide supplies the numerical progression; the item reference confirms the permanent final effect.
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Guides describe an upgrade loop involving the Etching Needle, enemy kills, and Franz at Marrow Keep:
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- Find the Etching Needle. Guides say this unlocks Tarstone upgrades with Franz.
- Equip Wretchcaller’s Stone and defeat enemies to earn experience for it.
- Return to Franz at Marrow Keep and pay Coin to temper the stone. A guide also identifies the upgrade location as the Tarforge in Marrow Keep.
The guides do not establish dependable, cross-verified Coin costs or experience thresholds, so those amounts should not be assumed. For the described unlock and upgrade sequence, see Gamepur’s guide and NerdsChalk’s guide.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is confirmed about the item
The official Mortal Shell II site confirms the game, but the item-specific route, effect values, and upgrade steps above come from third-party guides and an item database. The available sources do not establish patch-specific costs, experience thresholds, or platform-specific drop behavior. The official game site does not provide item-specific documentation for Wretchcaller’s Stone.
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