Thief’s Stone is a Combat Tarstone for a melee slot, earned by clearing the Corrupted Statue trial near the Gate of Infinity Beacon in Vestige of Infinity, and it builds Warp stacks when you strike enemies.
Thief’s Stone is one of the many Tarstones you slot into your gear to reshape how combat plays out, and this one is built entirely around the Warp status. It is a Combat Tarstone that goes into a melee slot, and instead of adding raw damage, it turns every connecting melee hit into Warp buildup. Below is where to grab it, exactly how its per-hit scaling works, and how to level it up once it’s yours.
Thief’s Stone quick facts
| Detail | Answer |
|---|---|
| Item type | Combat Tarstone |
| Compatible equipment | Melee slot |
| Main effect | Builds Warp stacks on melee hits |
| Status involved | Warp |
| Where it comes from | Corrupted Statue trial near the Gate of Infinity Beacon, Vestige of Infinity |
Key Use this as your at-a-glance card before you head out for it. It’s a fixed reward tied to a single encounter, so there’s nothing to farm and no roll to chase — clear the trial once and the stone is yours.
Where to find Thief’s Stone in Mortal Shell 2
Start at the Gate of Infinity Beacon
Rest or fast travel here, then head back down the flight of stairs that leads away from it.
Find the Corrupted Statue
Watch your left as you descend — the statue sits nearby on a circular platform, across from where the Map Fragment was located.
Clear the trial
Activate and complete the Corrupted Statue encounter to satisfy its challenge.
Claim Thief’s Stone
Take the Tarstone from the reward the moment the trial is cleared; it drops every time, so a clean clear is all you need.
From there you can carry on past the statue and up the stairs toward The Silent Steps Beacon, but the stone itself is already in your pocket the instant the trial resolves.
What Warp stacking does
| Level | Effect |
|---|---|
| Level 1 | 1 Warp stack per strike |
| Level 2 | 2 Warp stacks per strike |
| Level 3 | 3 Warp stacks per strike |
| Maximum level | Level 3; there is no Level 4 |
Thief’s Stone doesn’t hit harder — it hits more usefully. Every successful melee strike feeds the Warp status, so the stone rewards volume of hits rather than the weight of any single swing. That makes it a build-enabler: you’re using it to ramp Warp up quickly so a Warp-focused playstyle can snowball, not to pad your per-hit numbers.
The per-hit gain climbs cleanly as you level the stone, with documented values at all three levels:
At level 1 the stone produces 1 Warp stack per strike, rising to 2 stacks per strike at level 2 and 3 stacks per strike at level 3, its maximum rank. Beyond that, Warp’s own internal math — how high stacks cap, how fast they decay, and what numeric payoff they translate into — isn’t something the current data pins down, so build around the ramp speed the stone gives you rather than a specific cap.
Upgrading Thief’s Stone at the Tarforge
Tarstone upgrades all run through Franz at the Tarforge in Marrow Keep, but the option is gated behind a quest item. You need the Etching Needle, looted from a chest right before the fight with Magdalena, the Lady of the Woods. Hand it to Franz and it expands the Tarforge’s upgrade menu so Tarstones become eligible.
Leveling is earned through play: keep Thief’s Stone equipped and it gains XP from your kills. Once its XP bar fills, return to Franz to push it to the next rank. Each step costs Coin plus crafting materials, and higher ranks fold in Tarcore on top of the gold.
One caution on the economy side — Balance Patch 1 on PC (which landed on August 20–21, 2026) cut Gloom costs for weapon smelting and boosted gold drops, which shifts how fast you can afford upgrades. Older cost charts predate that rebalance, so lean on what the Tarforge quotes you in-game rather than a fixed number from an out-of-date guide.
Building around Thief’s Stone
Because Warp gain is tied to hit count, the stone pairs best with anything that lands a lot of strikes fast. A quick, multi-hit melee weapon — or any melee approach built on sustained pressure rather than slow, heavy single blows — ramps Warp far faster than a big-but-slow swing would. More contacts per second simply means more stacks per second.
Keep Thief’s Stone equipped in the melee slot with a fast multi-hit weapon — it stacks Warp quicker per fight and banks kill XP toward its next Tarforge rank at the same time.
Mistakes to avoid with Thief’s Stone
The biggest time-waster is treating it like a random drop. Thief’s Stone comes only from the Corrupted Statue trial in Vestige of Infinity — grinding standard enemies or cracking open chests for it will never work.
The other common trip-up is misreading the scaling. Level 1 grants 1 Warp stack per strike, level 2 grants 2, and level 3 grants 3; level 3 is the maximum, and there is no level 4. And with Warp bonuses and Tarstone costs both touched by recent balance changes, any specific Warp percentage, stack cap, or upgrade-cost chart pulled from an older writeup is worth double-checking against the live game before you plan around it.
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Frequently Asked Questions
Does Thief’s Stone drop from random enemies or chests?
No. It’s a guaranteed reward for clearing the Corrupted Statue trial near the Gate of Infinity Beacon, and there are no alternative drop sources or randomized loot rolls for it in the current game.
Is Thief’s Stone worth upgrading before elemental Tarstones?
Elemental infusion stones usually take priority for a top-tier upgrade, because pushing one to its highest rank makes its element permanently active on the weapon — a fundamental change to how it works. Higher Tarstone ranks also get expensive in materials, so most players are selective about which stones they carry all the way up. Thief’s Stone is very much worth leveling if you’re committing to a Warp build, but if you’re rationing rare upgrade materials, an elemental stone typically earns the first slot.
What should players verify after new balance patches?
Check Warp’s behavior and the stone’s per-hit values, since Warp was among the statuses reworked across launch and early patches, and re-confirm upgrade costs at the Tarforge, since Gloom and gold balance shifted with Balance Patch 1. Those are the numbers most likely to drift from older references.
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