Hollow Knight Silksong presents a sprawling Materium index that asks players to catalog 91 items across the world. This guide consolidates every entry, noting which items appear as you progress naturally and which require specific quests or careful searching. The list is organized to match the order you see when you view the Materium in Bellhome, a structure drawn from Rock Paper Shotgun’s coverage and Team Cherry’s guidance. While not mandatory for a 100 percent save, completing the Materium offers a satisfying sense of unearthing everything Silksong has to offer.
There are a great many entries, and some unlock automatically while others demand you chase down hidden corners or complete particular tasks. Early items begin with Silk, which is unlocked by default, followed by Shell Shards, Rosaries, and the various Rosary types, then Mossberry and its stew, and on through crafting and combat-related drops. The sequence continues with Pilgrim Shawl, Flintstone, Flintgem, Craftmetal, Crown Fragment, Horn Fragment, Silver Bell, Pale Oil, Plasmium, Plasmified Blood, Ragpelt, Pollip Heart, Roach Guts, Courier’s Swag, Queen’s Egg, Liquid Lacquer, Courier’s Rasher, Vintage Nectar, Pickled Muckmaggot, Crustnut, Steel Spines, and beyond. A number of items hinge on defeating bosses (such as the Skull Tyrant and Savage Beastfly) or on visiting specialized regions (the Choral Chambers, the Whispering Vaults, or the Forebrothers areas) to unlock them.
All Materium index items are listed in the order they appear when you view the Materium in Bellhome. The full roster includes Silk, plus the Shell Shards, Rosaries, and the variants (Shell Rosaries, Pearl Rosaries); Mossberry and its stew; and a string of material, relic, and heart entries tied to various acts and encounters. A number of these items are tied to specific gameplay moments: for example, Crown Fragment is earned by defeating the Skull Tyrant during The Terrible Tyrant Bone Bottom Wish, while Horn Fragment drops after defeating the Savage Beastfly for a Bellhart Wish. Others unlock through exploration, such as Silver Bell found during the Silver Bells Wish or Magnetite revealed by inspecting a deposit in the Brightvein on Mount Fay in Act 3. The Arcane Egg, meanwhile, is a late-game item that requires an Act 3 platforming challenge in the western Abyss to obtain. This set of entries is complemented by a parallel catalog of Relics, Bone Scrolls, Weaver Effigies, Choral Commandments, Rune Harps, Psalm Cylinders, and Memento items that round out the comprehensive collection.
The Materium guide is complemented by the Relics section, which is treated as a separate catalog in many references. The one notable exception is the Arcane Egg, which requires a late Act 3 sequence in the Abyss to reach. For more detail on where to locate Relics, players can consult dedicated guides; the Materium index itself emphasizes a complete, end-to-end understanding of what’s in the world and how the items unlock across the story’s phases. The list also notes that several items can be obtained through the course of standard exploration, while others require specific quest conditions, such as completing the Great Taste of Pharloom or triggering the various Wish events tied to Bellhart, the Silk and Soul Wish, or the Old Hearts sequence.
Bone Scrolls form a natural subset within the Materium, and they have distinctive locations. One Bone Scroll sits in a secret room beneath Greymoor in the south-central area. A second Bone Scroll lies in a hidden high room east of the Seamstress in Far Fields. A third is tucked behind a hidden breakable wall in western Underworks. The final Bone Scroll is perched atop the Wisp Thicket after a protracted platforming segment. These four entries are the core Bone Scrolls you’ll encounter during exploration.
Weaver Effigies offer three distinct placements, including a secret room high above Bone Bottom, a hallway accessible only from the Chapel of the Witch on the east side, and the southeastern end of the tunnels beneath The Slab. Choral Commandments appear across a handful of spots: one on a ledge high on the east wall above Bone Bottom, another on a surgical table in Whiteward, and a third at the far end of a high Whiteward hall that’s most easily reached via Silk Soar from Act 3. A fourth Choral Commandment is purchasable from Jubilana at the Songclave after The Lost Merchant Wish. Rune Harps occupy high ledges and deep tunnels, including northeastern Weavenest Alta, a long passage below Weavenest Cincril, and the southeastern end of the High Halls. An Arcane Egg appears after a lengthy platforming sequence in the western Abyss in Act 3.
Psalm Cylinders are distributed across multiple areas as well. A High Halls cylinder lies behind a breakable wall in the lower High Halls; another is found on a northeastern Underworks wall near the Whiteward connection, also behind a breakable barrier. A Whispering Vaults cylinder sits at the end of a platforming challenge along the way to a Lost Flea. A Grindle cylinder can be purchased from Grindle in the northern Blasted Steps once the double jump is unlocked. The Vaultkeeper Cardinius Lair cylinder resides in the northeastern chamber housing Vaultkeeper Cardinius, and the Sacred Cylinder is located in the lower reaches of the Whispering Vaults during the Vaultkeeper’s Melody objective.
All Materium Memento items spread across Act 1 through Act 3, and each is tied to a specific achievement or quest line. Sprintmaster Memento requires beating Sprintmaster Swift in all four races during Act 3. Guardian’s Memento comes from completing Shrine Guardian Seth’s questline in Act 3. Hero’s Memento requires finishing the Hero’s Call Wish in Act 3, while Hunter’s Memento comes from finishing the Hunter’s Journal as of Act 3. Grey Memento is earned by defeating the Watcher of the Edge boss in Act 3, and Surface Memento is granted by reaching the surface high above Pharloom in Act 3. Craw Memento depends on accepting the Craw Summons and following its questline through to the Crawfather. Encrusted, Pollen, Hunter’s, and Conjoined Heart entries can be obtained if collected in the right sequence after using other hearts to unlock the Everbloom late in Act 3. These Memento items round out the personal and world-spanning milestones that the Materium collects.
All Relic items are catalogued separately in our companion guide to where to find Relics in Silksong. The Arcane Egg remains a distinct late-game objective that requires Act 3 platforming to reach the Abyss’s southwestern areas. For a deeper dive into every step, the full 39-part walkthrough and a complete listing of all 48 bosses are available in dedicated guides that cross-reference these locations with in-game events and quest triggers.
If you’re aiming for 100 percent completion, this Materium index provides a clear map of what’s hidden across Pharloom and how many of the items you’ll encounter without chasing side quests. And while some of the items require specific conditions or boss fights, many entries simply emerge as part of normal exploration, making the journey through Silksong as rewarding as the destinations themselves.
For further reference, the core guide from Rock Paper Shotgun remains the most accessible consolidation of items and their locations, and it’s referenced here to ground the locations in widely shared community knowledge. The Materium index is a living guide, expanding as new discoveries are documented, but the structure above reflects the state of knowledge tied to Act 3 and earlier acts as summarized in the notes.
