Fossil

Fossils are a special type of currency that can be socketed into resonators to modify the crafting behavior in specific ways, released in the Delve league.

Fossils belong to the Stackable Currency item class for use in Item Filters.

Despite the similar wording to Chaos OrbsChaos OrbStack Size: 20Reforges a rare item with new random modifiersRight click this item then left click a rare item to apply it., using a resonator on an item with a metamod (such as prefixes cannot be changed or cannot roll caster modifiers) will completely ignore the effects of the modifier.

Obtaining

Fossil Remains, a kind of loot container for fossil

Some fossils are tied to specific Delve nodes.

• Crystal Spire: Hollow FossilHollow FossilStack Size: 10Has an Abyssal socketPlace in a Resonator to influence item crafting.
• Haunted Tomb: Tangled FossilTangled FossilStack Size: 10Makes a random modifier type much more likely and prevents
  another random modifier type
  Effects revealed once resonator is fully socketedPlace in a Resonator to influence item crafting.
• Humid Fissure: Fractured FossilFractured FossilStack Size: 10Creates a split copy
  Cannot be used to split Influenced,
  Enchanted, Fractured, or Synthesised itemsPlace in a Resonator to influence item crafting.
• Molten Cavity: Faceted FossilFaceted FossilStack Size: 10More Gem modifiersPlace in a Resonator to influence item crafting.
• Stonewood Hollow: Bloodstained FossilBloodstained FossilStack Size: 10Corrupted
  Has a Corrupted implicit modifierPlace in a Resonator to influence item crafting.
• Time-Lost Cavern: Glyphic FossilGlyphic FossilStack Size: 10Has a Corrupt Essence modifierPlace in a Resonator to influence item crafting.

Fossils are primarily found in Fossil Remains in the darkness between nodes or behind fractured walls depending on the biome. They can also be obtained as a chest reward at the end of some Delve encounters such as the Smuggler's Stash node. Niko, Master of the Depths can also sometimes sell fossils for a certain amount of azurite.

Fossils can also be obtained from a variety of other mechanics including:

• Sources of Delve rewards
• The Tinkerer's TableThe Tinkerer's Table55x FossilTrying to bring your vision to life is enough to drive you mad.
• Fossilised IncubatorFossilised IncubatorStack Size: 10Adds an incubated Fossil item to an equippable item
  Item drops after killing {0} monstersRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters.
• Ritual favour rewards
• Tujen's vendor window
• Unique Synthesis maps with the modifier Synthesised # Monsters have #% chance to drop a Fossil

Delve

List of fossil items organized by the Delve biomes you can obtain them from.

Biome	Fossil	Fossil found in location
Mines	Metallic FossilMetallic FossilStack Size: 20More Lightning modifiers No Physical modifiersPlace in a Resonator to influence item crafting.	Anywhere
Mines	Serrated FossilSerrated FossilStack Size: 20More Attack modifiers Fewer Caster modifiersPlace in a Resonator to influence item crafting.	Anywhere
Mines	Pristine FossilPristine FossilStack Size: 20More Life modifiers No Defence modifiersPlace in a Resonator to influence item crafting.	Anywhere
Mines	Aetheric FossilAetheric FossilStack Size: 20More Caster modifiers Fewer Attack modifiersPlace in a Resonator to influence item crafting.	Anywhere
Fungal Caverns	Tangled FossilTangled FossilStack Size: 10Makes a random modifier type much more likely and prevents another random modifier type Effects revealed once resonator is fully socketedPlace in a Resonator to influence item crafting.	Haunted Tomb nodes only
Fungal Caverns	Dense FossilDense FossilStack Size: 20More Defence modifiers No Life ModifiersPlace in a Resonator to influence item crafting.	Anywhere
Fungal Caverns	Aberrant FossilAberrant FossilStack Size: 20More Chaos modifiers No Lightning modifiersPlace in a Resonator to influence item crafting.	Anywhere
Fungal Caverns	Opulent FossilOpulent FossilStack Size: 20More Drop modifiers No Tagless modifiersPlace in a Resonator to influence item crafting.	Anywhere
Fungal Caverns	Corroded FossilCorroded FossilStack Size: 20More Physical Ailment or Chaos Ailment modifiers No Elemental modifiersPlace in a Resonator to influence item crafting.	Anywhere
Fungal Caverns	Gilded FossilGilded FossilStack Size: 10Item is overvalued by vendorsPlace in a Resonator to influence item crafting.	Behind Fractured Walls only
Petrified Forest	Bloodstained FossilBloodstained FossilStack Size: 10Corrupted Has a Corrupted implicit modifierPlace in a Resonator to influence item crafting.	Stonewood Hollow nodes only
Petrified Forest	Bound FossilBound FossilStack Size: 20More Minion, Aura or Curse modifiersPlace in a Resonator to influence item crafting.	Anywhere
Petrified Forest	Jagged FossilJagged FossilStack Size: 20More Physical modifiers No Chaos modifiersPlace in a Resonator to influence item crafting.	Anywhere
Petrified Forest	Corroded FossilCorroded FossilStack Size: 20More Physical Ailment or Chaos Ailment modifiers No Elemental modifiersPlace in a Resonator to influence item crafting.	Anywhere
Petrified Forest	Sanctified FossilSanctified FossilStack Size: 10Numeric modifier values are lucky High Level modifiers are more commonPlace in a Resonator to influence item crafting.	Behind Fractured Walls only
Abyssal Depths	Hollow FossilHollow FossilStack Size: 10Has an Abyssal socketPlace in a Resonator to influence item crafting.	Crystal Spire nodes only
Abyssal Depths	Aberrant FossilAberrant FossilStack Size: 20More Chaos modifiers No Lightning modifiersPlace in a Resonator to influence item crafting.	Anywhere
Abyssal Depths	Bound FossilBound FossilStack Size: 20More Minion, Aura or Curse modifiersPlace in a Resonator to influence item crafting.	Anywhere
Abyssal Depths	Gilded FossilGilded FossilStack Size: 10Item is overvalued by vendorsPlace in a Resonator to influence item crafting.	Behind Fractured Walls only
Abyssal Depths	Lucent FossilLucent FossilStack Size: 20More Mana modifiers No Speed modifiersPlace in a Resonator to influence item crafting.	Behind Fractured Walls only
Frozen Hollow	Glyphic FossilGlyphic FossilStack Size: 10Has a Corrupt Essence modifierPlace in a Resonator to influence item crafting.	Time-Lost Cavern nodes only
Frozen Hollow	Frigid FossilFrigid FossilStack Size: 20More Cold modifiers No Fire modifiersPlace in a Resonator to influence item crafting.	Anywhere
Frozen Hollow	Serrated FossilSerrated FossilStack Size: 20More Attack modifiers Fewer Caster modifiersPlace in a Resonator to influence item crafting.	Anywhere
Frozen Hollow	Prismatic FossilPrismatic FossilStack Size: 20More Elemental modifiers No Physical Ailment or Chaos Ailment modifiersPlace in a Resonator to influence item crafting.	Anywhere
Frozen Hollow	Sanctified FossilSanctified FossilStack Size: 10Numeric modifier values are lucky High Level modifiers are more commonPlace in a Resonator to influence item crafting.	Behind Fractured Walls only
Magma Fissure	Faceted FossilFaceted FossilStack Size: 10More Gem modifiersPlace in a Resonator to influence item crafting.	Molten Cavity nodes only
Magma Fissure	Scorched FossilScorched FossilStack Size: 20More Fire modifiers No Cold modifiersPlace in a Resonator to influence item crafting.	Anywhere
Magma Fissure	Prismatic FossilPrismatic FossilStack Size: 20More Elemental modifiers No Physical Ailment or Chaos Ailment modifiersPlace in a Resonator to influence item crafting.	Anywhere
Magma Fissure	Pristine FossilPristine FossilStack Size: 20More Life modifiers No Defence modifiersPlace in a Resonator to influence item crafting.	Anywhere
Magma Fissure	Deft FossilDeft FossilStack Size: 20More Critical modifiers No Attribute modifiersPlace in a Resonator to influence item crafting.	Anywhere
Magma Fissure	Fundamental FossilFundamental FossilStack Size: 20More Attribute modifiers No Critical modifiersPlace in a Resonator to influence item crafting.	Behind Fractured Walls only
Sulfur Vents	Fractured FossilFractured FossilStack Size: 10Creates a split copy Cannot be used to split Influenced, Enchanted, Fractured, or Synthesised itemsPlace in a Resonator to influence item crafting.	Humid Fissure nodes only
Sulfur Vents	Metallic FossilMetallic FossilStack Size: 20More Lightning modifiers No Physical modifiersPlace in a Resonator to influence item crafting.	Anywhere
Sulfur Vents	Opulent FossilOpulent FossilStack Size: 20More Drop modifiers No Tagless modifiersPlace in a Resonator to influence item crafting.	Anywhere
Sulfur Vents	Aetheric FossilAetheric FossilStack Size: 20More Caster modifiers Fewer Attack modifiersPlace in a Resonator to influence item crafting.	Anywhere
Sulfur Vents	Fundamental FossilFundamental FossilStack Size: 20More Attribute modifiers No Critical modifiersPlace in a Resonator to influence item crafting.	Anywhere

Note that the chests in the Smuggler's Stash node can randomly drop any type of fossil regardless of biome.

List of fossils

Main page: List of fossils

Item	Drop Level	Description	Drop Areas	Additional Drop Restrictions
Aberrant FossilAberrant FossilStack Size: 20More Chaos modifiers No Lightning modifiersPlace in a Resonator to influence item crafting.	1	More Chaos modifiers No Lightning modifiers	N/A	Found in Fungal Caverns and Abyssal Depths biomes in the Azurite Mine.
Aetheric FossilAetheric FossilStack Size: 20More Caster modifiers Fewer Attack modifiersPlace in a Resonator to influence item crafting.	1	More Caster modifiers Fewer Attack modifiers	N/A	Found in Mines and Sulphur Vents biomes in the Azurite Mine.
Bloodstained FossilBloodstained FossilStack Size: 10Corrupted Has a Corrupted implicit modifierPlace in a Resonator to influence item crafting.	1	Corrupted Has a Corrupted implicit modifier	N/A	Drops from completing a Stonewood Hollow node in Petrified Forest biomes in the Azurite Mine.
Bound FossilBound FossilStack Size: 20More Minion, Aura or Curse modifiersPlace in a Resonator to influence item crafting.	1	More Minion, Aura or Curse modifiers	N/A	Found in Petrified Forest and Abyssal Depths biomes in the Azurite Mine.
Corroded FossilCorroded FossilStack Size: 20More Physical Ailment or Chaos Ailment modifiers No Elemental modifiersPlace in a Resonator to influence item crafting.	1	More Physical Ailment or Chaos Ailment modifiers No Elemental modifiers	N/A	Found in Fungal Caverns and Petrified Forest biomes in the Azurite Mine.
Deft FossilDeft FossilStack Size: 20More Critical modifiers No Attribute modifiersPlace in a Resonator to influence item crafting.	1	More Critical modifiers No Attribute modifiers	N/A	Found in Magma Fissure biomes in the Azurite Mine.
Dense FossilDense FossilStack Size: 20More Defence modifiers No Life ModifiersPlace in a Resonator to influence item crafting.	1	More Defence modifiers No Life Modifiers	N/A	Found in Fungal Caverns and Petrified Forest biomes in the Azurite Mine.
Faceted FossilFaceted FossilStack Size: 10More Gem modifiersPlace in a Resonator to influence item crafting.	1	More Gem modifiers	N/A	Drops from completing a Molten Cavity node in Magma Fissure biomes in the Azurite Mine.
Fractured FossilFractured FossilStack Size: 10Creates a split copy Cannot be used to split Influenced, Enchanted, Fractured, or Synthesised itemsPlace in a Resonator to influence item crafting.	1	Creates a split copy Cannot be used to split Influenced, Enchanted, Fractured, or Synthesised items	N/A	Drops from completing a Humid Fissure node in Sulphur Vents biomes in the Azurite Mine.
Frigid FossilFrigid FossilStack Size: 20More Cold modifiers No Fire modifiersPlace in a Resonator to influence item crafting.	1	More Cold modifiers No Fire modifiers	N/A	Found in Frozen Hollow biomes in the Azurite Mine.
Fundamental FossilFundamental FossilStack Size: 20More Attribute modifiers No Critical modifiersPlace in a Resonator to influence item crafting.	1	More Attribute modifiers No Critical modifiers	N/A	Found in Magma Fissure and Sulphur Vents biomes in the Azurite Mine.
Gilded FossilGilded FossilStack Size: 10Item is overvalued by vendorsPlace in a Resonator to influence item crafting.	1	Item is overvalued by vendors	N/A	Found in Fungal Caverns and Abyssal Depths biomes in the Azurite Mine.
Glyphic FossilGlyphic FossilStack Size: 10Has a Corrupt Essence modifierPlace in a Resonator to influence item crafting.	1	Has a Corrupt Essence modifier	N/A	Drops from completing a Time-Lost Cavern node in Frozen Hollow biomes in the Azurite Mine.
Hollow FossilHollow FossilStack Size: 10Has an Abyssal socketPlace in a Resonator to influence item crafting.	1	Has an Abyssal socket	N/A	Drops from completing a Crystal Spire node in Abyssal Depths biomes in the Azurite Mine.
Jagged FossilJagged FossilStack Size: 20More Physical modifiers No Chaos modifiersPlace in a Resonator to influence item crafting.	1	More Physical modifiers No Chaos modifiers	N/A	Found in Petrified Forest biomes in the Azurite Mine.
Lucent FossilLucent FossilStack Size: 20More Mana modifiers No Speed modifiersPlace in a Resonator to influence item crafting.	1	More Mana modifiers No Speed modifiers	N/A	Found in Abyssal Depths biomes in the Azurite Mine.
Metallic FossilMetallic FossilStack Size: 20More Lightning modifiers No Physical modifiersPlace in a Resonator to influence item crafting.	1	More Lightning modifiers No Physical modifiers	N/A	Found in Mines and Sulphur Vents biomes in the Azurite Mine.
Opulent FossilOpulent FossilStack Size: 20More Drop modifiers No Tagless modifiersPlace in a Resonator to influence item crafting.	1	More Drop modifiers No Tagless modifiers	N/A	Found in Fungal Caverns and Sulphur Vents biomes in the Azurite Mine.
Prismatic FossilPrismatic FossilStack Size: 20More Elemental modifiers No Physical Ailment or Chaos Ailment modifiersPlace in a Resonator to influence item crafting.	1	More Elemental modifiers No Physical Ailment or Chaos Ailment modifiers	N/A	Found in Magma Fissure and Frozen Hollow biomes in the Azurite Mine.
Pristine FossilPristine FossilStack Size: 20More Life modifiers No Defence modifiersPlace in a Resonator to influence item crafting.	1	More Life modifiers No Defence modifiers	N/A	Found in Mines and Magma Fissure biomes in the Azurite Mine.
Sanctified FossilSanctified FossilStack Size: 10Numeric modifier values are lucky High Level modifiers are more commonPlace in a Resonator to influence item crafting.	1	Numeric modifier values are lucky High Level modifiers are more common	N/A	Found in Frozen Hollow and Petrified Forest biomes in the Azurite Mine.
Scorched FossilScorched FossilStack Size: 20More Fire modifiers No Cold modifiersPlace in a Resonator to influence item crafting.	1	More Fire modifiers No Cold modifiers	N/A	Found in Magma Fissure biomes in the Azurite Mine.
Serrated FossilSerrated FossilStack Size: 20More Attack modifiers Fewer Caster modifiersPlace in a Resonator to influence item crafting.	1	More Attack modifiers Fewer Caster modifiers	N/A	Found in Mines and Frozen Hollow biomes in the Azurite Mine.
Shuddering FossilShuddering FossilStack Size: 20More Speed modifiers No Mana modifiersPlace in a Resonator to influence item crafting.	1	More Speed modifiers No Mana modifiers	N/A	Found in Frozen Hollow biomes in the Azurite Mine.
Tangled FossilTangled FossilStack Size: 10Makes a random modifier type much more likely and prevents another random modifier type Effects revealed once resonator is fully socketedPlace in a Resonator to influence item crafting.	1	Makes a random modifier type much more likely and prevents another random modifier type Effects revealed once resonator is fully socketed	N/A	Drops from completing a Haunted Tomb node in Fungal Caverns biomes in the Azurite Mine.

Delve modifiers

Main page: List of Delve modifiers

Some fossils are able to roll modifiers exclusively obtained by crafting with fossils. This also includes legacy modifiers that were able to roll from regular fossils.

Related divination cards

The following divination cards can be exchanged for fossils:

Item	Stack Size	Description
The Tinkerer's TableThe Tinkerer's Table55x FossilTrying to bring your vision to life is enough to drive you mad.	5	5x Fossil

Version history

Version	Changes
3.16.0	Fossils and Resonators are now more commonly found within Delve, and less commonly found from other sources. Bloodstained FossilsBloodstained FossilStack Size: 10Corrupted Has a Corrupted implicit modifierPlace in a Resonator to influence item crafting. now Corrupt an Item, granting them a Corrupted Implicit Modifier (previously granted a Vaal Modifier). Enchanted Fossils have been renamed to Deft FossilsDeft FossilStack Size: 20More Critical modifiers No Attribute modifiersPlace in a Resonator to influence item crafting., which now grant more Critical Modifiers, and no Attribute Modifiers (previously granted a Labyrinth Enchantment). Encrusted Fossils have been renamed to Fundamental FossilsFundamental FossilStack Size: 20More Attribute modifiers No Critical modifiersPlace in a Resonator to influence item crafting., which now grant more Attribute Modifiers, and no Critical Modifiers (previously granted more Sockets, with the possibility of White Sockets). Tangled FossilsTangled FossilStack Size: 10Makes a random modifier type much more likely and prevents another random modifier type Effects revealed once resonator is fully socketedPlace in a Resonator to influence item crafting. now makes a random Modifier type much more likely, and prevents another random modifier type (previously granted any Fossil modifiers). The effects are fully revealed once a Resonator is fully Socketed.
3.12.4	Fossils can now be used on Heist Contracts, Blueprints and Ally Equipment.
3.12.0	Item modifier tags have been entirely reworked with a goal in mind of consistency and simplicity. These changes have negligible impacts to the odds of various modifiers appearing on rare items naturally, but may have impacts to the results of certain crafting methods. As a result of the above changes, several fossil descriptions have changed slightly.
3.10.0	Fossils can no longer craft any prefix or suffix mods that cannot be obtained elsewhere, with the exception of those granted by Faceted, Bloodstained and Hollow Fossils. Implicit modifiers (such as the one which changes an item's vendor sell price) remain. The following mods have been relocated, while all others can no longer be obtained: On Boots: +2 to level of socketed Fire Gems (now from Warlord's Influence), +2 to level of socketed Cold Gems (now from Redeemer's Influence), +2 to level of socketed Lightning Gems (now from Crusader's Influence), +2 to level of socketed Chaos Gems (now from Hunter's Influence), +1 to global level of raised Spectres (now from Elder's Influence). Helmet: Nearby Enemies have -x% Fire Resistance (now from Warlord's Influence), Nearby Enemies have -x% Cold Resistance (now from Redeemer's Influence), Nearby Enemies have -x% Lightning Resistance (now from Crusader's Influence), Nearby Enemies have -x% Chaos Resistance (now from Hunter's Influence), Nearby Enemies take x% increased Physical Damage (now from Elder's Influence), increased effect of Fortify (now from Crusader's Influence). Body Armour: Socketed Attacks have -15 to Mana Cost (now from Warlord's Influence), x% increased Aura Effect on you (now from Redeemer's Influence). Quiver: x% chance to gain a Frenzy Charge on hitting a Rare or Unique Enemy (now from Elder's Influence). Belt: Increased Chaos Damage (now from Hunter's Influence), increased Physical Damage (now from Elder's Influence), increased Elemental Damage (now from Shaper's Influence), increased Energy Shield from Body Armour (now from Shaper's Influence, and now a Prefix), chance for double Armour Effect when hit (now from Elder's Influence, and now a Prefix). Rings: Fire/Cold/Lightning/Physical/Chaos leech modifiers can now exclusively be found from special elemental Delve encounters. Weapons: Socketed Attacks/Spells deal x% more Damage (now found from Shaper's Influence), chance for Poison/Bleeding inflicted with this weapon to deal more damage (now found from Elder's Influence), chance to Intimidate on Hit (now found from Hunter's Influence), Auras from your Skills grant increased Damage to you and Allies (now from Redeemer's Influence). Jewels: Damage penetrates 1% Fire/Cold/Lightning/Elemental Resistance (now from Corrupted implicits). Glove, Amulet and Shield Fossil-exclusive modifiers can no longer be obtained in any form. Existing items will be unchanged.
3.4.0	Introduced to the game.