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Unwieldy Stone is described in Mortal Shell II guides as a Tarstone that spends Resolve on a charged heavy attack. A secondary guide reports that Merrick sells it in Marrow Keep for 2,000 coins and that tempering is unlocked through Etching Needles and Franz at the Tarforge. Those acquisition and upgrade details are not confirmed by the official sources cited here, so check the current in-game prompts before relying on them.
What the Unwieldy Stone does
Guides call the item Unwieldy Stone, although the assigned topic uses “Unwieldy Tarstone.” The available descriptions point to the same item: a Tarstone ability that consumes Resolve to perform a charged heavy attack. A secondary wiki independently supports that broad description.
The sources do not establish its current Resolve cost, damage, startup, reach, stagger, or weapon compatibility. Treat those details as build-dependent unless you can confirm them in your game.
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How to get the Unwieldy Stone
NerdsChalk’s guide, updated August 21, 2026, reports that Merrick sells the stone in Marrow Keep for 2,000 coins. This is a secondary-guide claim, not a price confirmed by the official game materials cited here. Check Merrick’s current inventory and price in-game before budgeting for it.
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How Tarforge tempering is reported to work
The same guide reports that Tarstone tempering becomes available after you find Etching Needles in a chest near the arena leading to Magdalena in the Glutted Mire and bring them to Franz at the Tarforge in Marrow Keep. It says a slotted Tarstone gains XP before it can be tempered there. The official sources cited here do not confirm those exact steps, costs, or current upgrade effects; follow the Tarforge’s in-game instructions if they differ.
What is known about upgrades and version changes
NerdsChalk’s guide describes later tempering as improving Leech and adding health restoration on a kill. These are guide-reported effects, not verified current-build values. Do not assume a particular healing trigger or benefit without checking the item and Tarforge descriptions in your version.
The official Week 1 Update announcement, dated August 29, 2026, says the update added Fragile Tarstones and changed Tarcore returns when Tarstones are tempered. The cited announcement excerpt does not name Unwieldy Stone or confirm its ability text, so it provides system context rather than a definitive change log for this item.
How to judge whether tempering is worthwhile
No verified numerical comparison between Unwieldy Stone’s levels or competing Tarstones is established by the cited sources. To compare it in your current build, record these details from the game rather than relying on an unsupported “best upgrade” ranking:
Quick Recap
Rank #4
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- Resolve required for the charged attack.
- Attack startup, reach, damage, and stagger.
- The exact trigger and amount of any sustain effect.
- Tempering materials and coin costs at each step.
- Whether the ability works with your weapon setup.
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