Silksong’s The Slab: A Prison Break Guide to Keys, Cold, and the First Sinner
The Slab in Hollow Knight: Silksong: a concise prison-break guide covering capture, keys, rewards, survival tricks, and the First Sinner.
As of 2026, The Slab remains one of Hollow Knight: Silksong’s most memorable detours: a freezing prison full of stolen gear, rude keys, and one very stubborn boss. A player does not stumble into it by accident. The Slab has a nasty habit of taking everything away first and explaining nothing until much later. Here is the full route, from capture to the First Sinner, with the important keys, rewards, and survival tricks in plain language.
Getting Captured Is the Point
To reach The Slab, a player needs solid progress on the Flea Caravan quest. That means moving the caravan into Greymoor, gathering more fleas so it moves again, and fighting Moorwing if that fight was skipped. Freeing the thief in Deep Docks also matters. After that, bulky armored flies carrying cages begin to spawn, including one at the now-empty Flea Caravan spot in Greymoor. Do not dodge and kill it immediately. Let it capture Hornet. If the cage and silk binding work, the screen fades to black, and the prison break begins.
No Nail, No Cloak, No Shame
Hornet wakes up stripped of her nail and clothes. No floating, no tools, no combat strength. She can still punch, dash, and cling to walls, which is enough to start trouble. The nearby doors are locked, so head down and left. Above another locked door is a very breakable ceiling. Break it, climb through, and find the thieves who stole the gear. Outside is bitterly cold, so keep moving and enter the first door on the right. The enemies inside are pushovers. Drop through the floor hole, and Grindle appears behind a door. He is absolutely no help, but freeing him is funny enough to count as a prerequisite.
Key of Indolent
Head left and run. Traps punish slow movement, so dash across them. The Key of Indolent hangs from a chain, and grabbing it triggers an ambush. Clear the room, then open the Door of Indolent on the right. Speak to Grindle again, enjoy the nearby bench, and jump into the hole in the rightmost wall for a map. Break debris above the previous room for a shortcut, go down and left to free a flea, then return to the rightmost door and open another Door of Indolent.
The final pressure plate in that room locks the doors and spawns enemies. Lure them into trap positions, step on plates on purpose, and finish them quickly. After escaping, ascend the wall carefully with dashes to avoid spikes. Before the top, when the left side converges, break rocks in the alcove for a secret tunnel containing shards, a frayed Rosary String, and a shortcut back to the central room. Then climb the tower while watching the huge side pressure plates.
Freezing Cold and Key of Heretic
Up top, the cold returns. Avoid combat and move fast. The flaming coals are safe zones; run back to them when needed. From the first flame, go left past a spike trap, drop to another safe zone, then continue left across the lower spikes. Guards hit hard, and Hornet is not equipped for a fair fight. Memorize guard positions, jump to the right wall, dash through the corridor, and reach the next loading zone. Drop down the pit, go down and left to a bench, then head right to the room holding the stolen clothes and needle.
Hornet starts the recovery by snapping the neck of the thief wearing her clothes, which restores her abilities and needle. The fight is still real. Small enemies are mashable, but big flies need dodging. Avoid their ground slam, hit a few times, wait, and counter. Grey goop only locks Hornet in place for a couple of seconds, but it can cause unnecessary damage. Clear the room to claim the Key of Heretic. Only the Key of Apostate remains. Drop south, and remember to re-equip tools at the nearest bench.
The Underbelly and the Apostate Problem
Unlock the floor at the bottom of the central room, flip switches until the left door opens, grab the shard bundle, and jump the chain-bound platforms to a top hole. Another outdoor segment follows, so be quick. Wall jump right for a spool upgrade, then go back down and through the hole. Follow the Bellway sign, fight through enemies that are now child’s play, and pass another Apostate-locked door. The Bellway toll costs 50 Rosaries, which also means a player can leave if backtracking is needed. Mount Fay is to the left, but it needs a grapple. A tunnel to the right hides a quick bench; the flea above it needs double jump.
From here, the route points toward Bilewater out of Sinner’s Road for the Key of Apostate. A player needs the grapple and double jump. Bilewater will suck. That is not a warning; it is a personality trait.
Key of Apostate
In Bilewater, climb upward. Go right, up, then all the way left to activate the Bellway, which is the only bench for a long, long time. From that bench, head up, right, and climb the massive room. Take either top exit into the next room, wall jump and grapple across everything, and enter the top right exit. A bench appears at a very ill-timed moment. It is a troll. Do not fall for it.
Move slowly, back up when enemies appear, and protect health. Before wall jumping at the end of the tunnel, break the wall in the maggot water on the bottom right for a secret bench that makes the section far more bearable. Left of that is a combat room full of surprise bush enemies. Summons or projectiles help because those things are annoying to catch and hard to dodge.
Then comes Groal the Great. He lobs exploding projectiles, tries to vacuum Hornet in, and has a terrible hitbox that makes nail damage awkward. Save projectiles and summons, play at range, wait for his shots, dodge, and punish. His second phase brings back soul blasts from the original game, but the attack is well-choreographed and offers a real damage window. After several attempts and hours of life lost, a bench appears as the reward. Go left, grab the unrelated house item, lower the wall, jump up, and climb into a slightly terrifying area. Continue up, take the left tunnel, deal with the Moss Charger-like enemy or the Rain World-esque vine, and break the cage far left to return to The Slab.
Apostate Doors and the Upper Door
Stag back to The Slab, climb up, and open the Apostate door that once locked the bottom right of the map. Climb the walls to open a shortcut to the main room. In the newly unlocked cave, head right to read about sins, flutter into a ceiling hole, and break a crumbling wall on the right for a Memory Locket. The cave also connects to the trap room. Inside the big circular door, play the mandolin to summon the Old Penitent, who shares more lore the longer Hornet plays.
Near the top, the upper Apostate door leads to pressure plates and sluggish spike balls. Pogo off the spike ball to ascend. Push the plate to call it back, dive kick, double jump, dive kick again, then wall jump on the metal to the right and time another wall jump to land on the upper ledge. A grapple can save a bad jump. The reward is a Mask Shard, which is the main reason to visit now.
Lower Caverns and the First Sinner
Back in the central room, a Heretic-locked door on the right is hilariously ineffective at keeping Hornet out. In the big pit, go left, break red crystals, cross the lake, climb the tunnel, fight thieves, break the right wall, and open a shortcut. Drop into the water at the bottom of the central room and break crystals to the right. Spikes and crumbling floors are everywhere. At the tunnel’s end sits a Weaver Effigy for the Bellhart collector. Return to the Heretic room for about 150 Rosaries, jump on the chest, and flutter into another ceiling hole. There, the first Penitent waits in chains. Slash the chain connections to free it.
Inside the cage, a Weaver statue starts the First Sinner boss fight. It works like the Dream Bosses from Hollow Knight: losing boots Hornet out without killing her, so repeated attempts are fine, though tool ammo still needs refreshing. Stay airborne, because almost nothing hits high up. Wait out attacks, dodge needles, get behind her, and strike. Interrupt her binding animation for a free hit and to stop whatever she is planning. After the first death, the fight gets harder. Exploding circles appear, so run to safety and stop attacking for a moment. She is most vulnerable while spawning needles, but watch the white lines on screen when attacking. After the win, bind with her, clear simple grapple and double-jump platforming, and claim a new Silk Skill. The Slab is complete, and every stolen treasure has been accounted for.
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