Mastering the Hollow Knight Charm System: Locations, Synergies, and Builds

In the crumbling, insect-inhabited kingdom of Hallownest, the strength of the Knight is determined not just by the sharpness of their Nail, but by the magical accessories they carry. Charms are the cornerstone of Hollow Knight's customization system. These mystical artifacts provide a staggering array of buffs, ranging from simple navigation aids to game-changing combat modifiers that can redefine your entire playstyle.

Understanding how to collect, manage, and combine these 45 unique items is the difference between succumbing to the dangers of the Deepnest and conquering the most brutal challenges in the Godhome.

The Foundation of the Charm System

Before diving into individual charms, it is essential to master the mechanics that govern their use. The charm system is not a "set and forget" equipment screen; it is a dynamic puzzle that changes based on your current objective.

The Charm Notch System

Every charm in Hollow Knight has a specific "Notch Cost," representing the mental and physical burden of carrying such power. You begin your journey with a meager 3 notches, which limits you to the most basic equipment. However, as you explore the world, you can expand your capacity to a maximum of 11 notches.

To equip or swap charms, the Knight must be resting at a Bench. This mechanical limitation encourages players to plan ahead. If you are entering a boss arena, you might swap your exploration-focused charms for raw damage or survival tools.

How to Get All 8 Additional Charm Notches

To reach the peak of 11 notches, you must complete specific milestones:

Salubra’s Shop (Crossroads): Purchase 4 notches from Charm Lover Salubra. These unlock sequentially as you collect more charms (5, 10, 18, and 25 charms required).
Fungal Wastes: Defeat the two Shrumal Ogres in a hidden arena.
Fog Canyon: Located in a hidden room near Cornifer; requires Isma’s Tear or Monarch Wings to reach.
Colosseum of Fools: Complete the Trial of the Warrior.
Grimm Troupe DLC: Defeat Troupe Master Grimm.

The Art of Overcharming

Overcharming is a hidden mechanic for high-risk, high-reward players. If you have at least one open notch, you can attempt to equip a charm that costs more than your remaining slots. By repeatedly trying to slot the charm (usually five attempts), the UI will crack, and the charm will force itself into place.

In this Overcharmed state, you take double damage from all sources. While this sounds suicidal, it is the optimal strategy for "Radiant" difficulty boss fights in the Hall of Gods, where any single hit results in instant death anyway. In such cases, the double damage penalty is irrelevant, allowing you to stack massive power.

The Three Great Transformations: Upgradable Charms

While there are 45 charms in the game's code, your inventory will only ever hold 40 at a time because five specific charms undergo permanent transformations.

1. Fragile to Unbreakable (Heart, Greed, Strength)

Found early in the Fungal Wastes from Leg Eater, the Fragile charms offer massive benefits for a low price, but they break if you die. To make them permanent, you must summon the Grimm Troupe and find Divine in Dirtmouth.

Unbreakable Strength is widely considered the best charm in the game, providing a 50% increase to Nail damage. It costs a staggering 15,000 Geo to upgrade, but it is a mandatory investment for the late game.

2. Grimmchild vs. Carefree Melody

The Grimmchild evolves as you defeat Grimm Kin. At the end of the questline, you face a choice:

Complete the Ritual by defeating Nightmare King Grimm to keep the fully evolved Grimmchild.
Banish the Troupe to receive Carefree Melody, a charm that grants a random chance to block incoming damage.

3. Kingsoul to Void Heart

The Kingsoul is a 5-notch charm that slowly regenerates Soul. It is primarily a story item used to access the Birthplace in the Abyss. Once you reach the bottom of the Abyss and interact with the reflection, the Kingsoul is consumed and replaced by the Void Heart. This 0-cost charm is permanent and unlocks the game’s true endings while turning the siblings in the Abyss passive.

The Complete Encyclopedia of All 45 Charms

To build the perfect Knight, you must know where to find every piece of the puzzle.

Combat and Nail Charms

These focus on direct physical damage and reach.

Wayward Compass (1 Notch): Found at Iselda’s shop. Essential for beginners to see their location on the map.
Gathering Swarm (1 Notch): Found at Sly’s shop. A swarm of flies collects Geo dropped by enemies, preventing it from falling into pits.
Stalwart Shell (2 Notches): Found at Sly’s shop. Increases invincibility frames after taking damage. Excellent for "tank" builds.
Steady Body (1 Notch): Found at Salubra’s shop. Removes the knockback the Knight receives when hitting an enemy. Pro-tip: This is vital for maintaining high DPS while standing on small platforms.
Heavy Blow (2 Notches): Found at Sly’s shop. Increases the knockback dealt to enemies. Often counter-productive as it pushes enemies out of your reach.
Quick Slash (3 Notches): Found in a hidden room in Kingdom’s Edge. Allows the Knight to slash much faster. This is the single highest DPS increase for Nail-focused builds.
Longnail (2 Notches): Found at Salubra’s shop. Increases Nail range slightly.
Mark of Pride (3 Notches): Found in the Mantis Village after defeating the Mantis Lords. Provides a massive range increase, allowing you to outrange many bosses.

Soul and Spell Charms

These enhance the Knight's ability to cast spells and heal.

Soul Catcher (2 Notches): Found in the Ancestral Mound. Increases Soul gained per hit.
Soul Eater (4 Notches): Found in the Resting Grounds. Greatly increases Soul gain but is very expensive.
Shaman Stone (3 Notches): Found at Salubra’s shop. Increases the size and damage of spells. This is the core of any "Mage" build.
Spell Twister (2 Notches): Found in the Soul Sanctum. Reduces the Soul cost of spells, allowing four casts from a full meter instead of three.
Quick Focus (3 Notches): Found at Salubra’s shop. Speeds up the Focus (healing) animation. A lifesaver in fast-paced boss fights like Pure Vessel.
Deep Focus (4 Notches): Found in Crystal Peak. Heals two masks at once but slows down the animation. Best used for exploration rather than combat.

Defensive and Survival Charms

These help you stay alive longer in the harsh environments of Hallownest.

Baldur Shell (2 Notches): Found in Howling Cliffs. Creates a shield while healing.
Defender’s Crest (1 Notch): Dropped by the Dung Defender. Emits a toxic cloud that deals minor damage to nearby foes.
Spore Shroom (1 Notch): Found in Fungal Wastes. Emits a cloud of spores when healing.
Thorns of Agony (1 Notch): Found in Greenpath. Lashes out with vines when you take damage. Great for new players who struggle to dodge.
Hiveblood (4 Notches): Found in the Hive. Regenerates the last lost mask over time. Mandatory for the Path of Pain.
Joni’s Blessing (4 Notches): Found in Howling Cliffs. Converts all health to Lifeblood (cannot be healed) but increases total health by 40%.
Shape of Unn (2 Notches): Found in Isma’s Grove. Allows the Knight to move while healing, effectively dodging under many attacks.

Movement and Utility Charms

Dashmaster (2 Notches): Found in Fungal Wastes below the Mantis Village. Allows more frequent dashes and downward dashing.
Sprintmaster (1 Notch): Found at Sly’s shop. Increases movement speed.
Dream Wielder (1 Notch): Found at the Seer in Resting Grounds. Speeds up the Dream Nail, making it viable for harvesting Soul during boss fights.

Hidden Charm Synergies: The Secret Interactions

Hollow Knight does not explicitly tell you that certain charms interact with each other. Discovering these synergies is key to advanced gameplay.

1. The Stinking Minions (Defender’s Crest + Glowing Womb)

Normally, Glowing Womb spawns tiny flies that deal physical damage. With the Defender’s Crest equipped, the flies become explosive dung-bugs that deal impact damage and leave a toxic cloud behind. This significantly increases their damage output.

2. The Agile Spiders (Weaversong + Sprintmaster)

Weaversong summons three small spiders that attack enemies. If you equip Sprintmaster, the spiders move much faster and can jump further to reach flying enemies. If you add Grubsong to this mix, the spiders will actually generate Soul for the Knight whenever they hit an enemy, creating a "passive Soul farm."

3. The Ultimate Spell Build (Shaman Stone + Flukenest)

Flukenest replaces the Vengeful Spirit with a burst of tiny flukes. Shaman Stone makes these flukes significantly larger, turning the spell into a shotgun-style blast that can one-shot many mini-bosses if all flukes hit.

4. The Explosive Spore (Spore Shroom + Defender’s Crest)

Equipping both turns the spore cloud into a toxic dung cloud that deals damage more rapidly and lasts longer.

5. The Fury of the Elegy (Grubberfly’s Elegy + Fury of the Fallen)

Normally, Grubberfly’s Elegy only fires projectiles at full health. However, if you are at 1 HP and have Fury of the Fallen equipped, the projectiles will fire again, but this time they are red and deal significantly boosted damage.

Strategic Builds for Every Situation

Mastering the charm system means knowing how to adapt. Here are the most effective builds used by the community.

The "Nail Master" Build (Boss Killer)

Unbreakable Strength (3)
Quick Slash (3)
Mark of Pride (3)
Steady Body (1)
Nailmaster’s Glory (1)
Goal: Maximum physical reach and DPS. This build allows you to stay close to bosses and overwhelm them with sheer speed.

The "Spell Caster" Build (Burst Damage)

Shaman Stone (3)
Spell Twister (2)
Soul Catcher (2)
Quick Slash (3)
Wayward Compass/Steady Body (1)
Goal: Use the Nail to quickly farm Soul, then unleash Abyss Shrieks or Descending Darks to melt health bars.

The "Immortal Explorer" Build (Safe Exploration)

Hiveblood (4)
Grubsong (1)
Quick Focus (3)
Gathering Swarm (1)
Dashmaster (2)
Goal: Never worry about health or Geo. Hiveblood will heal you back from platforming mistakes, and Grubsong ensures you always have Soul for emergency heals.

The "Godhome Radiant" Build (Overcharmed)

Unbreakable Strength (3)
Quick Slash (3)
Shaman Stone (3)
Mark of Pride (3)
Total Cost: 12 (Overcharmed)
Goal: Since you die in one hit in Radiant mode, defense is useless. This build maximizes both Nail and Spell damage to end the fight as quickly as possible.

How to Optimize Your Charm Loadout

When choosing charms, consider the "Soul Economy." If a boss moves quickly and rarely leaves openings to heal, charms like Quick Focus are a better investment than Deep Focus.

If you find yourself constantly being knocked back into hazards while attacking, Steady Body is not a "noob trap"—it is a top-tier utility charm used by speedrunners to maintain momentum.

Finally, always remember that Nailmaster’s Glory (1 Notch) is one of the most efficient charms in the game. It allows you to charge Great Slashes in less than a second, which is invaluable for clearing annoying flying enemies in the Colosseum of Fools.

Summary

The charm system in Hollow Knight is a masterpiece of game design that rewards experimentation and environmental awareness. Whether you prefer the raw power of the Nail, the arcane devastation of Spells, or a passive army of minions, there is a charm combination suited for your journey. Collecting all 45 charms is not just a completionist goal; it is the key to unlocking the Knight’s true potential and surviving the darkest corners of Hallownest.

FAQ

What is the best charm in Hollow Knight?

While subjective, Unbreakable Strength is widely considered the best overall charm due to its 50% flat increase to Nail damage without any drawbacks. Quick Slash and Shaman Stone are close seconds for Nail and Spell builds, respectively.

Can I get Fragile Strength back if it breaks?

Yes. You must return to Leg Eater in the Fungal Wastes. He will repair the charm for a Geo fee. If you have the Defender’s Crest equipped, he will offer a discount on the repair cost.

How do I get 11 notches?

You must collect enough charms to buy all notches from Salubra (requires 25 charms found), defeat the Shrumal Ogres in Fungal Wastes, complete the first trial in the Colosseum of Fools, defeat Troupe Master Grimm, and find the hidden notch in Fog Canyon.

Is Overcharming worth it?

In normal gameplay, usually no, as double damage is extremely punishing. However, for Radiant Bosses in Godhome (where any hit kills you anyway) or for highly skilled players who don't plan on getting hit, it allows for incredibly powerful builds that exceed the 11-notch limit.

Does Kingsoul disappear forever?

Yes. Once you transform the Kingsoul into the Void Heart at the bottom of the Abyss, you can never get the Kingsoul back. However, the Void Heart costs 0 notches and is required for the best endings, making it a strictly better item for most players.