Mortal Shell 2: Weeping Stone Location and Trauma Sidearm Infusion

The Weeping Stone is one of the few Tarstones in Mortal Shell 2 that you cannot pull out of a chest or earn from a boss. It sits in a merchant’s inventory, that merchant only exists after dark, and the stall is a short run from a beacon most players have already lit. Once it is yours, your Sidearm stops being a chip-damage tool and starts stacking a status effect.

Quick answer: Summon the night by speaking to Thestus on the roof of Marrow Keep, fast travel to the Abandoned Outpost beacon in the Outskirts of Mammon, then buy the Weeping Stone from The Collector for 1,500 Coin.

What the Weeping Stone does to your Sidearm

The Weeping Stone is an Infusion-type Tarstone, so it only fits a Sidearm slot — it will not go onto a melee weapon. With it equipped, you spend 20 Resolve to infuse your Sidearm with Trauma. Trauma deals Break damage over time, meaning your shots feed into posture breaking rather than just shaving off health.

Triggering it happens mid-combat rather than in a menu. While aiming, press the infusion input to apply the effect and trigger abilities. Resolve is the same resource you sacrifice for talents, so the infusion competes with everything else drawing from that pool until you upgrade the stone.

Harbinger aiming a Sidearm at an enemy with the crosshair and enemy health bar on screen — Aiming down the Sidearm is the moment you press the infusion input to apply Trauma. Image: Cold Symmetry

The stone is compatible with the Ballistazooka Sidearm. If you are running a different Sidearm, the stone will not slot in.

Switch the world to night before you travel

The Collector is a night-only merchant. Arrive during the day and there is simply nobody at the spot, which is where most failed trips come from. Night mode itself is gated behind the Gloombound Flame from the Great Arbiter of Flesh boss area, so if you have not reached that point yet, the stone is out of reach for now.

Head to Marrow Keep and climb to the roof. This is the same hub area where the Tarforge and its NPCs live, so you can handle upgrades on the same trip.

Speak to Thestus and choose the option to summon the night. The world state flips over, and you will see the transition play out before you regain control.

The Harbinger standing under a hanging brazier facing the central altar at Marrow Keep — The rooftop altar area at Marrow Keep, where Thestus handles the day-night switch. Image: Cold Symmetry

In-game message reading By the light of day with an ESC Close prompt over a dark scene — An on-screen message confirms the world has shifted state. Image: Cold Symmetry

Weeping Stone location: The Collector at the Abandoned Outpost

With night active, the merchant appears near the Abandoned Outpost beacon in the Outskirts of Mammon. The stall is a short walk from the beacon itself, tucked up a set of stairs.

Open the map and fast travel to the Outskirts of Mammon, then make your way toward the Abandoned Outpost. If you already have the outpost beacon lit, travel straight there instead.

The rest at beacon prompt appearing as the Harbinger walks up to a lit beacon — Beacons double as fast travel points, so light the outpost one on your first visit. Image: Cold Symmetry

Run the path toward the outpost. Enemies patrol the route and a bridge section along the way, so it is faster to sprint past them than to clear the area.

The Harbinger crossing a wooden bridge toward enemies on the route to the outpost — The bridge crossing on the run out to the Abandoned Outpost. Image: Cold Symmetry

From the Abandoned Outpost beacon, take the stairs to find The Collector standing at a stall. Interact and pick Trade to open the shop.

Buy the Weeping Stone for 1,500 Coin. Only one is stocked, and the purchase is a one-time cost — the 20 Resolve is a separate in-combat cost each time you infuse.

The Collector’s inventory is worth scrolling through while you are there, since several other rare Tarstones sit at the same 1,500 Coin price point.

Item	Notes
Weeping Stone	1,500 Coin, one in stock, Sidearm infusion
Fulminant Stone	Sidearm Tarstone
Infested Stone	Sidearm Tarstone
Infused Stone	Tarstone
Blacknarrow Key	Key item
Glimpse, Thoracium, Tarcore	Consumables and materials

Weeping Stone upgrade levels and Trauma uptime

At its base level the infusion is short-lived, and every upgrade buys you more uptime rather than more damage. The final tier removes the Resolve juggling entirely by making the effect permanent.

Tier	Effect
Base	Consume 20 Resolve to infuse your Sidearm with Trauma
First upgrade	Infusion lasts for 4 shots
Second upgrade	Infusion lasts for 8 shots
Third upgrade	Infusion is permanent

Note: some level numbering in the game counts the base effect as Level 1, so the permanent tier can show up as either Level 3 or Level 4 depending on where you are reading it. The progression of effects is the same either way.

How to upgrade the Weeping Stone at the Tarforge

Tarstone upgrades are not available at the Tarforge by default. You have to unlock that option first, and the key is a quest item called the Etching Needle.

Collect the Etching Needle from the chest placed just before the Magdalena, the Lady of the Woods boss fight. When you spot Ruk past the bridge, drop through the opening and turn right before the tunnel to reach a small area with a bone chest.

Take the Needle to Franz at Marrow Keep and hand it over. This expands the Tarforge so it can temper Tarstones at all.

Equip the Weeping Stone and go kill things. Tarstones only gain experience while they are actually slotted in, and the stone starts at 0 out of 10,000 XP for its first tier.

Return to Franz once the XP bar is full and pay the Coin cost to push the stone to the next level. Repeat the cycle of earning experience and paying Coin until the infusion is permanent.

Why the Weeping Stone or The Collector may not appear

There are only a handful of reasons this goes wrong, and all of them are easy to check before you make the trip.

The world is still in its day state — the stall will be empty until you summon the night through Thestus.
You have not obtained the Gloombound Flame yet, so the night option is not available to you.
You are under 1,500 Coin, since the stone has a fixed price and no cheaper alternative.
The Tarforge shows no upgrade option because Franz has not received the Etching Needle.
The stone gained no experience because it was sitting in your inventory instead of equipped.

Confirmation that everything worked is straightforward. After the purchase, the Weeping Stone shows up in the Tarstones menu at Level 1 with an XP bar attached, and once equipped to your Sidearm the Trauma effect appears on enemies as ticking Break damage after you infuse. If enemies are taking hits but no Trauma is building, the infusion has either run out of shots or was never triggered while aiming.