Mortal Shell II - Tarstones

Tarstones are modular socketable relics discovered throughout Fallgrim and its dungeons. Players can equip up to 10 Tarstones at once (4 Shell-compatible, 2 Combat, 2 Infusion, and 2 Ability slots) to fine-tune stat proficiencies, add status effects, and unlock gameplay modifiers.

Overview Bosses 10 Items 11 Locations 9 Shells 9 Tarstones 18 Weapons 10

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of 18 entries · updated 2026-08-20

Combat Tarstones

Directly enhance offensive parameters, posture damage, combo chains, and critical strike damage.

Name	Type	Description	Slot	Rarity	Effect	Source
Tarstone of the Posture Breaker	Combat Modifier	Crystallized black tar infused with kinetic tremors, allowing weapon strikes to shatter enemy defensive stances with ease.	Combat Slot	Rare	Increases posture damage dealt by heavy attacks and jump strikes by +25%.	Found in a hidden chest within the Desolate Keep armory.
Tarstone of the Serrated Edge	Combat Modifier	Jagged mineral flakes that embed themselves into weapon edges to carve open grievous wounds.	Combat Slot	Uncommon	Critical strikes apply a deep laceration that inflicts 15% bonus physical bleed damage over 6 seconds.	Looted from the bandit captain in the Gloomwood canopy.
Tarstone of Kinetic Recoil	Combat Modifier	Harmonically tuned tarstone that captures the kinetic shock of an impact and discharges it instantaneously.	Combat Slot	Rare	Successful perfect parries deflect 40% of the incoming attack's base damage back at the attacker as blunt shockwave damage.	Reward for completing the Parrying Trial in the Marrow Keep arena.
Tarstone of the Executioner	Combat Modifier	A dark obsidian stone pulsing with the thrill of fatal strikes, empowering the wielder upon executing defenseless foes.	Combat Slot	Legendary	Execution ripostes restore 1 full Resolve bar and grant a 10-second buff increasing melee attack power by 20%.	Dropped by Droeg the Conqueror upon defeat.

Infusion Tarstones

Imbue weapon attacks with elemental affinities, elemental buildup, or area-of-effect elemental bursts.

Name	Type	Description	Slot	Rarity	Effect	Source
Tarstone of Glacial Cinder	Infusion Modifier	Permafrost crystal encased in solidified tar, radiating an intense sub-zero chill.	Infusion Slot	Rare	Imbues melee attacks with +18 Frost buildup. Fully frozen targets take 30% bonus damage from blunt weapon attacks.	Recovered from the frozen martyr shrine in the Sunken Catacombs.
Tarstone of the Volcanic Heart	Infusion Modifier	A smoldering volcanic tar nugget harvested from the molten vents of the Obsidian Caldera.	Infusion Slot	Rare	Weapon attacks have a 25% chance to ignite enemies, dealing continuous Fire damage and preventing posture regeneration.	Found near the lava pool at the base of the Obsidian Caldera.
Tarstone of Venomous Resin	Infusion Modifier	Coated in the toxic secretions of Gloomwood arachnids, seeping poison directly into target veins.	Infusion Slot	Uncommon	All basic light attacks inflict +12 Poison buildup. Poisoned enemies have their attack speed reduced by 10%.	Harvested from spider nests in the Gloomwood Shallows.
Tarstone of Void Resonance	Infusion Modifier	An enigmatic piece of pure celestial matter harvested from the fallen Undermether's core.	Infusion Slot	Legendary	Converts 20% of physical damage into Void elemental damage, which ignores all standard physical armor plating.	Dropped by Sir Isaac the Scholar-Prince.

Support Tarstones

Provide defensive wards, stamina-free mobility enhancements, Tar and Glimpse multipliers, and sustain.

Name	Type	Description	Slot	Rarity	Effect	Source
Tarstone of Amber Vitae	Support Modifier	Golden amber tar that revitalizes the organic vessels inhabited by the Harbinger.	Shell / Support Slot	Uncommon	Increases total maximum Health by +15% and increases healing received from consumables by 20%.	Purchased from Sester Genessa after offering 3 Glimpses.
Tarstone of the Mether's Ward	Support Modifier	Inscribed with protective celestial sigils that buffer the Harbinger against unnatural blights.	Shell / Support Slot	Rare	Reduces incoming elemental and status effect damage by 20%, and prevents instant death from environmental hazards.	Located behind a secret stone gate in Fallgrim Shallows.
Tarstone of the Glimpse Conduit	Support Modifier	A shimmering stone that acts as a spiritual beacon, drawing wandering memories into your grasp.	Shell / Support Slot	Rare	Increases Glimpse gain by 50% and causes elite enemies to occasionally drop extra Glimpse Stones.	Discovered in the Undermether Spire reliquary room.
Tarstone of the Sester's Tear	Support Modifier	A sanctified tear shed by an ascended Sester, offering divine salvation at the threshold of demise.	Shell / Support Slot	Legendary	When taking fatal damage, instantly hardens and restores 30% HP instead of being ejected from the Shell (Cooldown: 10 minutes).	Reward for completing Sester Genessa's pilgrimage side quest.

Ability Tarstones

Boost Resolve generation, reduce ability cooldowns, and supercharge Shell-specific active skills.

Name	Type	Description	Slot	Rarity	Effect	Source
Tarstone of Resolve Surge	Ability Modifier	A crackling mineral formation that fuels the Harbinger's combat focus under relentless pressure.	Ability Slot	Rare	Generates +35% additional Resolve from aggressive offensive combos and consecutive weapon strikes.	Found in the training barracks within Marrow Keep.
Tarstone of Hardened Momentum	Ability Modifier	Stores ambient kinetic pressure while hardened and discharges it in a concussive shockwave.	Ability Slot	Rare	Hardening for at least 1.5 seconds builds up an explosive burst that knocks back all surrounding enemies when breaking harden.	Found inside the bell tower of the Bone-Carved Citadel.
Tarstone of the Pulse Echo	Ability Modifier	Resonates with the harmonic heartbeat of the Undermether, sustaining healing through deep resonance.	Ability Slot	Legendary	Casting Mether's Pulse releases a secondary healing wave 3 seconds later that heals for 50% of the initial value and cleanses all debuffs.	Found in the inner sanctum of the Chamber of the First Ovum.

Fragile Tarstones

High-risk, extreme-reward modifiers that grant immense offensive power but break upon taking lethal damage or being ejected.

Name	Type	Description	Slot	Rarity	Effect	Source
Tarstone of the Glass Harbinger	Fragile Modifier	A razor-thin crystalline relic that pushes the physical shell to transcendent heights of lethality at the cost of extreme vulnerability.	Universal Slot	Legendary (Fragile)	Increases all damage dealt by +50%, but increases all damage taken by 40%. Breaks permanently upon death.	Purchased from the Shady Smuggler in Fallgrim for 10,000 Tar.
Tarstone of Reckless Zeal	Fragile Modifier	Fills the vessel with blinding adrenaline, abandoning defensive patience for pure savagery.	Universal Slot	Rare (Fragile)	Melee attack speed increased by 30%, but Hardening cooldown is increased by 100%. Breaks upon shell ejection.	Found pinned to the executioner's block in Desolate Keep.
Tarstone of Cursed Wealth	Fragile Modifier	A blackened talisman cursed by greedy merchant guilds, rewarding flawless dungeoneering with unfathomable fortune.	Universal Slot	Legendary (Fragile)	Defeated enemies yield +100% bonus Tar and double item drops, but you lose ALL accumulated Tar upon death.	Discovered in the vault beneath the Sunken Catacombs.

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