Tarstones are socketable upgrade stones. The in-game Tarstones menu groups every stone under four headers: Support, Combat, Infusions, and Abilities. Those headers are independent of which equip slot (Melee / Sidearm / Support) the stone plugs into. Unlike a Shell's personal upgrade tree, Tarstones are shared finds that carry over between Shells once you have them.
What Are Tarstones?
75 stones in the in-game Tarstones menu, grouped under four headers: Support, Combat, Infusions, and Abilities. Those headers are independent of which equip slot (Melee / Sidearm / Support) the stone plugs into. Many Tarstones fit any weapon of the matching slot type, but a meaningful share are restricted to one specific named weapon or a short list of them.
Tarstone Slots
All Tarstones
Every Tarstone in the in-game menu, listed in the same order the inventory uses - Support → Combat → Infusions → Abilities, then each stone's internal row order.
| Name | Category | Slot | Effect | |
|---|---|---|---|---|
| Support | ||||
 | Auspicious Stone | Support | Support | Improves melee Critical Chance |
 | Headsman's Stone | Support | Support | Improves melee Critical Damage |
 | Devout Stone | Support | Support | Killing an enemy with your Sidearm: |
 | Shattering Stone | Support | Support | On killing an enemy: |
 | Berserker's Stone | Support | Support | Improves melee damage the lower your Health is |
 | Marksman's Stone | Support | Support | Improves ranged Critical Chance |
 | Deadeye Stone | Support | Support | Improves ranged Critical Damage |
 | Siegebreaker's Stone | Support | Support | Improves ranged Stagger Damage |
 | Spite Stone | Support | Support | Improves ranged damage the lower your Health is |
 | Bulwark Stone | Support | Support | On killing an enemy: |
 | Retribution Stone | Support | Support | Improves Riposte damage |
 | Gloombound Stone | Support | Support | Slain foes drop more Gloom |
 | Justiciar's Stone | Support | Support | Slain foes drop more Coin |
| Combat | ||||
 | Wounding Stone | Combat | Melee | Melee attacks inflict Perforation |
 | Grudge Stone | Combat | Melee | Your Weapon deals a guaranteed Critical Hit |
 | Duality Stone | Combat | Melee | Your Weapon light attack combo strikes twice |
 | Unyielding Stone | Combat | Melee | Your Weapon light attack combo has Stagger immunity |
 | Parasitic Stone | Combat | Melee | Slaying foes grants the stone Leech stacks. |
 | Thief's Stone | Combat | Melee | Striking foes grants you Warp |
 | Stillblade's Stone | Combat | Melee | Grants access to a special Light Combo Finisher |
 | Zealot's Stone | Combat | Melee | Grants access to a special Light Combo Finisher |
 | Clerik's Stone | Combat | Melee | Grants access to a special Heavy Combo Finisher |
 | Tyrant's Stone | Combat | Melee | Grants access to a special Heavy Combo Finisher |
 | Enfeebling Stone | Combat | Sidearm | Projectiles inflict Fragile |
 | Shuddering Stone | Combat | Sidearm | Projectiles generate a Knockback shockwave on impact |
 | Pulse Stone | Combat | Sidearm | Projectiles generate a shockwave on impact that pulls enemies in |
 | Ironpiercer's Stone | Combat | Sidearm | Projectiles pierce through enemies |
 | Myriad Stone | Combat | Sidearm | Your Sidearm fires multiple projectiles in an arc without consuming additional Resolve |
 | Splitting Stone | Combat | Sidearm | Your Sidearm fires multiple projectiles without consuming additional Resolve |
 | Rupturing Stone | Combat | Sidearm | Projectiles that strike critically deal Break Damage |
 | Blackblood Stone | Combat | Sidearm | Projectiles explode mid-air and deal splash damage |
 | Corroded Stone | Combat | Sidearm | Projectiles start dealing damage over time after hitting their target |
 | Squall Stone | Combat | Sidearm | Projectiles spin in place for a duration after hitting their target |
 | Charged Stone | Combat | Sidearm | Your Sidearm charges up faster |
 | Unstable Stone | Combat | Sidearm | Hitting the same enemy times triggers an explosion that deals splash damage |
 | Volatile Fragment | Combat | Sidearm | Enemies dying by a ranged attack will explode dealing splash damage |
| Infusions | ||||
 | Arbiter's Prize | Infusions | Melee | Consume Resolve to infuse your Weapon with Bloodcurse |
 | Serpent Stone | Infusions | Melee | Consume Resolve to infuse your Weapon with Poison |
 | Voltaic Crown | Infusions | Melee | Consume Resolve to infuse your Weapon with Lightning |
 | Warden's Stone | Infusions | Melee | Consume Resolve to infuse your Weapon with Frost |
 | Curseblood Stone | Infusions | Melee | Consume Resolve to infuse your Weapon with Curse |
 | Nightgrasp Stone | Infusions | Melee | Consume Resolve to infuse your Weapon with Phantom |
 | Torpor Stone | Infusions | Melee | Consume Resolve to infuse your Weapon with Stasis |
 | Wretchcaller's Stone | Infusions | Melee | Consume Resolve to infuse your Weapon with Trauma |
 | Inflamed Clawstone | Infusions | Melee | Consume Resolve to infuse your Weapon with Burn |
 | Hag Stone | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Poison |
 | Emberseed Stone | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Burn |
 | Viletongue Hedron | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Bloodcurse |
 | Voltaic Amber | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Lightning |
 | Frostshard Stone | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Frost |
 | Monarch's Vestige | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Phantom |
 | Accursed Stone | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Curse |
 | Weeping Stone | Infusions | Sidearm | Consume Resolve to infuse your Sidearm with Trauma |
| Abilities | ||||
 | Acolyte's Stone | Abilities | Melee | Consume Resolve to perform a Charged Light Attack |
 | Unwieldy Stone | Abilities | Melee | Consume Resolve to perform a Charged Heavy Attack |
 | Magdalena's Memento | Abilities | Melee | Consume Resolve to rise into the air and unleash a flurry of ruthless strikes. |
 | Captive's Scabstone | Abilities | Melee | Consume Resolve to swing your weapon in a violent arc, striking down all who stand close |
 | Conqueror's Reward | Abilities | Melee | Consume Resolve to drive your weapon forward in a series of swift, piercing thrusts |
 | Infused Stone | Abilities | Melee | Consume Resolve to throw your weapon to strike multiple targets before it circles back to you |
 | Shrike Stone | Abilities | Melee | Consume Resolve to leap high and plunge your Weapon into the ground ahead |
 | Colossus Stone | Abilities | Melee | Consume Resolve to thrust your weapon into the ground to send shockwaves rippling through nearby foes |
 | Lost Clotstone | Abilities | Melee | Consume Resolve to spin in place and release your weapon with brutal force |
 | Scholar's Wormstone | Abilities | Melee | Consume Resolve over time to set the chainsaw in motion, augmenting your every attack |
 | Clockwork Shardstone | Abilities | Melee | Consume Resolve over time to hold your weapon before you with its chainsaw spinning at full speed |
 | Hexapod Core | Abilities | Melee | Consume Resolve to carve through enemies with a rapid succession of strikes |
 | Solnir Shard | Abilities | Sidearm | Consume Resolve to launch a heavy round in a parabolic arc that bursts on impact to deal splash damage |
 | Confessor's Keepsake | Abilities | Sidearm | Consume Resolve to charge your Sidearm, firing a powerful, devastating shot |
 | Fusillade Stone | Abilities | Sidearm | At Resolve or higher, unleash a flurry of consecutive shots |
 | Barrage Stone | Abilities | Sidearm | Consume Resolve to launch a heavy round that detonates above the target, scattering explosive projectiles below |
 | Tarred Fragment | Abilities | Sidearm | Consume Resolve to fire multiple tethered projectiles, spinning at high speed |
 | Fulminant Stone | Abilities | Sidearm | Consume Resolve to fire a heavy-caliber round that triggers multiple explosions around the target |
 | Strange Remnant | Abilities | Sidearm | Consumes Resolve to unleash a stream of projectiles that chain between multiple targets |
 | Infested Stone | Abilities | Sidearm | Consumes Resolve to fire a clinging projectile that triggers a massive explosion after a brief delay |
 | Summoning Stone | Abilities | Sidearm | Consume Resolve to summon the last slain foe to fight on your side |
 | Hand of Rock | Abilities | Sidearm | Consume Resolve to unleash a swarm of relentless homing projectiles |
Looking for a Shell's own passive upgrade tree instead? That's a separate system entirely, unique per Shell, unlocked with Glimpses rather than found/socketed like a Tarstone, and listed on each Shell's own page.