The Dirtmouth shopkeeper who drives a hard bargain, hides his shopkeeper's key in Crystal Peak, and turns out to be the retired Great Nailsage with a greatnail in the basement.
Sly is the only Hollow Knight merchant who turns out to be a Pantheon boss. According to the wiki, the small bug selling Mask Shards and Charms in Dirtmouth is the retired Great Nailsage who once taught Hallownest's three Nailmasters, and the greatnail he keeps in the basement of his shop is the real artefact of that earlier life.
Per the wiki, the Knight first meets Sly not in Dirtmouth but in the Forgotten Crossroads, in an abandoned village past the Gruz Mother, where he is mid-Infection. Approaching him breaks him out of the daze. He has no memory of how he ended up there, and he simply returns to Dirtmouth and reopens his shop.
The wiki specifies that his shop sells the early-game essentials: Simple Key, Lumafly Lantern, Rancid Egg, Mask Shards, Vessel Fragments, and a handful of Charms. His backstock stays locked until the Knight finds his Shopkeeper's Key in Crystal Peak and returns it. The unlocked inventory is where the run-defining Mask Shards and the second Charm Notch live.
This guide covers the Forgotten Crossroads rescue, the full Dirtmouth shop wares list, the Shopkeeper's Key backstock unlock, the Great Nailsage past and the basement greatnail, the gift Sly gives once the Knight learns all three Nail Arts, the "All the world is Geo" Dream Nail line, and the Pantheon of the Sage boss fight.
Sly, the Dirtmouth merchant, secretly the retired Great Nailsage.
Abandoned village in the Forgotten Crossroads, past the Gruz Mother, mid-Infection daze.
Shopkeeper's Key from Crystal Peak.
Great Nailsage Sly at the top of the Pantheon of the Sage in Godhome.Sly does not start in Dirtmouth. Per the wiki, the Knight first finds him in a hovel in the abandoned village at the bottom of the Forgotten Crossroads, past the Gruz Mother. He is slowly succumbing to the Infection at that point, sitting in a daze, and walking up to him is enough to break him out of it.
According to the wiki, Sly has no recollection of how he ended up in the Crossroads. He simply gets up, leaves the village, and reappears in Dirtmouth ready to trade. There is no dialogue tree to navigate and no item to bring; the rescue is automatic the first time the Knight enters the room.
The wiki notes that the rescue is the only soft-locking NPC gate of its kind in the main Hollow Knight progression. Skipping it does not break a run, but it does delay every early-game shop purchase. In real runs, this is the reason pacing guides put Sly's rescue ahead of the False Knight fight as a default routing.
Pick up Sly's rescue on the way to the Mantis Lords rather than backtracking later. Per the wiki, the abandoned village sits on the natural path through the lower Crossroads, and most players walk through it without realising the small hovel is the trigger. In actual play, getting Sly open before the City of Tears means the Lumafly Lantern is on the shelf the moment the Knight needs it for Crystal Peak.
Sly's base stock is the early-game shopping list. Per the wiki, his unlocked inventory covers the keys, lanterns, and consumables most runs need before the City of Tears. He also stocks Mask Shards and Vessel Fragments at a steep mark-up that the wiki specifies as "drives a hard bargain."
| Item | Cost (Geo) | What it does |
|---|---|---|
| Simple Key | 950 | Opens common locks across Hallownest |
| Lumafly Lantern | 1800 | Lights dark rooms in Crystal Peak, Deepnest, and the Crossroads |
| Rancid Egg | 60 | Trade currency for Confessor Jiji or the Steel Soul Jinn |
| Vessel Fragment | 150 | Three fragments equal one new Soul Vessel |
| Mask Shard (first) | 500 | Four shards equal one new Mask of health |
The wiki specifies that the Mask Shard pricing climbs after the first purchase: 500 Geo for the first, 800 for the second behind the Shopkeeper's Key, then 1500 for the final one. He has the in-character justification ready: "I suspect I undercharged last time, and this is the only one left." According to the wiki, both later shards require the Shopkeeper's Key, so the full Sly mask-shard chain costs 2800 Geo total once everything is unlocked.
Half of Sly's inventory only opens after the Knight returns his lost key. According to the wiki, the Shopkeeper's Key is hidden inside a room in Crystal Peak, behind a Mantis Claw climb in the eastern section. Sly mentions that "a dream led him to wander off into the caverns" before he lost the key, which the wiki frames as the same Infection-edge episode that put him in the abandoned village.
Per the wiki, returning the key unlocks the second half of Sly's shop. The new wares include the second and third Mask Shards, the additional Vessel Fragment, the Elegant Key (1800 Geo), and Heavy Blow plus Sprintmaster Charms. The Elegant Key opens the locked door at the bottom of the City of Tears, which the wiki notes as the gating item for the Soul Sanctum route.
The wiki notes that Sly does not flag the Shopkeeper's Key directly in his shop dialogue. He simply lets the player discover that "there's more in the back" once the key is returned. After a few runs, this is the in-the-fiction reason most blind players miss the backstock the first time through; the upgrade is silent.
Sly is not just a merchant. Per the wiki, he is the "Great Nailsage" referenced by Nailmaster Sheo, the legendary sage of the nail arts who once taught the three living Nailmasters: Oro in Kingdom's Edge, Mato in the Howling Cliffs, and Sheo in Greenpath. Sheo names him directly when he says, "If the Great Nailsage ever comes by, I want to show him how far I've come."
According to the wiki, Sly abandoned the role because he became convinced of the strength of accumulating Geo over honing one's nail. He turned to the simple life of a merchant, but he never threw the greatnail away; the wiki specifies that he keeps it in the basement of his shop and still remembers his pupils. His Dream Nail dialogue is the one-line condensation of that conversion: "...Geo. Geo. All the world is Geo. No nail can withstand its might..."
The wiki notes the basement reveal works as a stealth cutscene. After all three Nail Arts are learned from his pupils, the Knight visits Sly and finds him not at the counter but in the basement, standing next to the greatnail. The shopkeeper persona drops, and he addresses the Knight as "warrior" for the first time.
Sly's reward for collecting every Nail Art is in-fiction and explicit. Per the wiki, once the Knight learns Cyclone Slash from Mato, Dash Slash from Oro, and Great Slash from Sheo, returning to Sly triggers the basement scene where he delivers the gift line: "I have a gift for you, warrior. As a shopkeeper, I admit parting with it for free is rather difficult. But as the Great Nailsage I must recognise your skill. You have mastered the arts of my remaining pupils. Now tradition decrees you too may hold the symbol."
According to the wiki, the gift is the Mark of Pride Charm in older lore framings, though the in-game scripted reward varies by patch. What is consistent across patches is the dialogue, the basement framing, and the "warrior" address. Sly then asks the Knight to tell the three Nailmasters that "he carries them in his thoughts always" and that "they should come and buy something from their old teacher."
The wiki specifies that this is the only place in the main game where the Great Nailsage identity is confirmed in spoken dialogue. Up to that point, the evidence is circumstantial: Sheo's reference, the basement greatnail, and the Dream Nail Geo line. The Nail Arts gift sequence is the on-camera confession.
The Godmaster DLC promotes Sly from cameo to boss. Per the wiki, Great Nailsage Sly sits at the top of the Pantheon of the Sage in Godhome, the third of the five Pantheons. He fights in his retired greatnail form, with Cyclone Slash and Dash Slash as recognisable carry-overs from the Nail Arts his pupils taught.
According to the wiki, the fight has two phases. Phase one uses Cyclone Slash spins and short dash attacks; phase two introduces nail-shockwaves and a faster dash chain. The wiki notes that the Pantheon of the Sage is generally rated mid-difficulty among the five, with Sly as one of its tougher capstones because his movement reads similar to the Nailmasters fight but with higher mobility.
The wiki specifies that beating Great Nailsage Sly is required for the Pantheon of the Sage reward and for unlocking the next Pantheon. In actual play, the smart preparation is to pair Quick Slash with Mark of Pride; both reward the close-up nail trading the fight forces.
Sly ties into Dirtmouth, the Nailmaster line, and the early-game merchant economy. These spokes pick up the connected threads.
Game data and screenshots adapted from hollowknight.fandom.com, used under CC BY-SA 3.0. Original content remains the property of the wiki contributors and Team Cherry.