All Materium items and locations in Hollow Knight: Silksong

Having trouble finding all the items you need to complete the Materium index in Hollow Knight Silksong? It's a long list, and you'll be canvassing the entirety of Pharloom to find everything, from the depths of the world to its highest peaks. Some of the items you need you'll find naturally as you play, while others you'll need to specifically seek out.

In the guide below, we'll list every single item you need to catalogue in the Silksong Materium, as well as where to find each item in the world. Buckle in, it'll take a minute.

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Where to find all Materium items in Hollow Knight Silksong

There are 91 items you need to find and collect to complete the Materium index. A good portion you'll add to your collection simply by playing. After finding the Materium in the upper reaches of the Memorium region, then returning to Bellhart and installing it in your Bellhome, you'll likely have at least a few entries already filled out. Many of the others are quest-locked or relate to specific items hidden throughout the world.

Here's the full Materium items list presented in the order it appears when you view the Materium in your Bellhome.

All Materium index items

• Silk: Unlocked by default.
• Shell Shards: Unlocked by picking up a Shell Shard.
• Rosaries: Unlocked by picking up any rosary.
• Shell Rosaries: Unlocked by collecting a Shell Rosary for the first time.
• Pearl Rosaries: Unlocked by collecting a Pearl Rosary for the first time.
• Mossberry: Unlocked by finding your first Mossberry.
• Mossberry Stew: Unlocked by speaking to the Druid with the Great Taste of Pharloom Wish active.
• Pilgrim Shawl: Collected from defeated pilgrims as part of the Garb of the Pilgrim's Bone Bottom Wish.
• Flintstone: Unlocked by interacting with the Flintstone on the way to the Forebrothers Signis and Gron boss fight.
• Flintgem: Unlocked by defeating Flintbeetles during the Volatile Flintbeetles Bone Bottom Wish.
• Craftmetal: Unlocked by collecting your first Craftmetal.
• Crown Fragment: Unlocked by defeating the Skull Tyrant during The Terrible Tyrant Bone Bottom Wish.
• Horn Fragment: Unlocked by defeating the Savage Beastfly during the Savage Beastfly Bellhart Wish.
• Silver Bell: Unlocked by finding a Silver Bell during the Silver Bells Wish.
• Pale Oil: Unlocked by collecting Pale Oil in the Choral Chambers, Whispering Vaults, or via completing the Great Taste of Pharloom quest.
• Plasmium: Unlocked by collecting Plasmium during the Alchemist's Assistant Wish.
• Plasmified Blood: Unlocked by collecting Plasmified Blood during the Advanced Alchemy Wish in Act 3.
• Ragpelt: Unlocked by gathering Ragpelt during the Crawbug Clearing Wish Bellhart Wish.
• Pollip Heart: Unlocked by gathering a Pollip Heart during the Rite of the Pollip Wish.
• Roach Guts: Unlocked by picking up from slain Muckroaches during the Roach Guts Wish.
• Courier's Swag: Given by Couriers Tipp and Pill for Courier quests.
• Queen's Egg: Unlocked by taking on the Courier quest from Tipp and Pill.
• Liquid Lacquer: Unlocked as a reward from Tipp and Pill for the Liquid Lacquer Wish.
• Courier's Rasher: Unlocked by selecting it as your courier quest during the Great Taste of Pharloom Wish.
• Vintage Nectar: Unlocked by purchasing it from Creige during the Great Taste of Pharloom Wish.
• Pickled Muckmaggot: Unlocked by picking it up after the Disgraced Chef Lugoli boss fight on Sinner's Road.
• Crustnut: Unlocked after finding it in the Sands of Karak.
• Steel Spines: Unlocked by purchasing them on the quest for the Witch's Crest.
• Choir Cloak: Unlocked by collecting them from Pilgrim enemies during the Cloaks of the Choir Wish.
• Magnetite: Unlocked by inspecting the Magnetite deposit in the Brightvein on Mount Fay in Act 3.
• Broodmother's Eye: Unlocked by obtaining it from the Broodmother boss.
• Seared Organ: Unlocked by defeating enemies with fire-type Tool damage during the Broodfeast Wish.
• Shredded Organ: Unlocked by defeating enemies with slashing-type Tool damage during the Broodfeast Wish.
• Skewered Organ: Unlocked by defeating enemies with piercing-type Tool damage during the Broodfeast Wish.
• Voltridian: Unlocked by interacting with the Voltridian deposit in the Sands of Karak.
• Hermit's Soul: Unlocked after obtaining it from the Bell Hermit during the Silk and Soul Wish.
• Maiden's Soul: Unlocked after obtaining it from the Chapel Maid during the Silk and Soul Wish.
• Seeker's Soul: Unlocked after obtaining it in a nearby room after you defeat Groal the Great.
• Pollen Heart: Unlocked after obtaining it for defeating Nyleth during The Old Hearts.
• Hunter's Heart: Unlocked after obtaining it for defeating Skarrsinger Karmelita during The Old Hearts Wish
• Encrusted Heart: Unlocked after obtaining it for defeating Crust King Khann during The Old Hearts Wish.
• Conjoined Heart: Unlocked by obtaining the item by defeating the Clover Dancers in Verdania.

All Materium Relic items

We've catalogued all the Relic items in our complete guide to where to find all Relics in Silksong. For much more detail on where to find these items, check out that guide. We've listed their locations briefly here for completion's sake.

The one exception to that rule is the Arcane Egg, which you need to reach Act 3 of Silksong to acquire and complete a grueling platforming challenge in the southwestern Abyss to find.

All Bone Scrolls

• Bone Scroll: South central Greymoor in a secret room beneath the ground.
• Bone Scroll: In a hidden high room east of the Seamstress in Far Fields.
• Bone Scroll: Behind a hidden breakable wall in western Underworks.
• Bone Scroll: At the top of the Wisp Thicket after a long platforming challenge.

All Weaver Effigies

• Weaver Effigy: In a secret room high above Bone Bottom.
• Weaver Effigy: At the east end of a hallway only accessible from the Chapel of the Witch.
• Weaver Effigy: At the southeasternmost end of the tunnels beneath The Slab.

All Choral Commandments

• Choral Commandment: On a ledge on the east wall high above Bone Bottom
• Choral Commandment: On a surgery table in the northwestern section of Whiteward.
• Choral Commandment: At the end of a hall in the highest part of Whiteward, best accessible via Silk Soar from Act 3.
• Choral Commandment: Purchased from Jubilana at the Songclave following The Lost Merchant Wish.

All Rune Harps

• Rune Harp: On a high ledge in northeastern Weavenest Alta.
• Rune Harp: At the end of a long passage below Weavenest Cincril.
• Rune Harp: At the southeasternmost end of the High Halls.
• Arcane Egg: After a long platforming section in the western Abyss in Act 3.

All Psalm Cylinders

• Psalm Cylinder - High Halls: Found behind a breakable wall in the lower High Halls.
• Psalm Cylinder - Underworks: Found in the northeastern Underworks near the connection to Whiteward, behind a breakable wall.
• Psalm Cylinder - Whispering Vaults: Found at the end of a long platforming challenge that's also kind of on the way to a Lost Flea.
• Psalm Cylinder - Grindle: Purchased from Grindle in the northern Blasted Steps once you have the double jump.
• Psalm Cylinder - Vaultkeeper Cardinius Lair: In the northeastern portion of the chamber where Vaultkeeper Cardinius lives.
• Sacred Cylinder: Found in the lower reaches of the Whispering Vaults during the search for the Vaultkeeper's Melody objective.

All Materium Memento items

• Sprintmaster Memento: Obtained by beating Sprintmaster Swift in all four races during Act 3.
• Guardian's Memento: Obtained by completing Shrine Guardian Seth's questline in Act 3.
• Hero's Memento: Obtained by completing the Hero's Call Wish in Act 3.
• Hunter's Memento: Obtained by completing the Hunter's Journal as of Act 3.
• Grey Memento: Obtained by defeating the Watcher of the Edge boss in Act 3.
• Surface Memento: Obtained by reaching the surface, high above Pharloom, in Act 3.
• Craw Memento: Obtained by accepting the Craw Summons and following its questline until you defeat the Crawfather.
• Encrusted/Pollen/Hunter's/Conjoined Heart: Obtained if collected following the use of other hearts to earn the Everbloom late in Act 3.

While completing the Materium is not required for a 100% save file in Silksong, there's something to be said about knowing you've seen literally everything the game has to offer. Our full 39-part walkthrough has much more to discover, and you can also find a full listing of all 48 bosses here.