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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Unbreakable Strength raises the Knight’s Nail damage by 50% and, unlike Fragile Strength, does not break when you die. To obtain it, buy Fragile Strength from Leg Eater, equip it, then give it to Divine after the Grimm Troupe arrives in Dirtmouth and pay her 15,000 Geo.
What Unbreakable Strength does
The charm increases damage dealt with the Nail by 50%. Its effect is the same as Fragile Strength’s; the difference is that Unbreakable Strength survives the Knight’s death. The cited damage values, rounded by the game, are:
| Nail upgrade | Damage with Unbreakable Strength |
|---|---|
| 0 | 8 |
| 1 | 14 |
| 2 | 20 |
| 3 | 26 |
| 4 | 32 |
The rounding is to the nearest integer, with halfway results rounded to the nearest even integer. These damage values and mechanics are documented by the Hollow Knight Wiki; its page does not state a publication year or game version.
How to get Unbreakable Strength
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Buy Fragile Strength
Find Leg Eater in the Fungal Wastes and buy Fragile Strength for 600 Geo. Wearing Defender’s Crest reduces its price to 480 Geo.
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Bring the Grimm Troupe to Dirtmouth
Progress until the Grimm Troupe arrives in Dirtmouth and Divine becomes available.
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Equip and hand over the charm
Equip Fragile Strength before speaking to Divine. Give her the charm when prompted, then pay 15,000 Geo for the permanent upgrade. Divine upgrades the charm; she does not sell Unbreakable Strength as a standalone purchase.
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If you have multiple fragile charms equipped, Divine takes them in this order: Fragile Heart, Fragile Greed, then Fragile Strength. Equip only the charm you intend to upgrade before handing one over. The acquisition details are listed by the Hollow Knight Wiki.
Fragile Strength vs. Unbreakable Strength
| Charm | Nail damage effect | What happens on death | How you obtain it |
|---|---|---|---|
| Fragile Strength | Increases Nail damage by 50%. | Breaks and must be repaired by Leg Eater. | Buy it from Leg Eater for 600 Geo, or 480 Geo while wearing Defender’s Crest. |
| Unbreakable Strength | Increases Nail damage by 50%. | Does not break. | Give equipped Fragile Strength to Divine and pay 15,000 Geo. |
In other words, the upgrade preserves the offensive effect while removing the death-related repair cost and interruption.
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What the damage bonus affects
The bonus applies to Nail hits, but not Nail Arts or damage from Sharp Shadow, Dreamshield, or Thorns of Agony. Quick Slash is described as especially effective with Strength because it lets the Knight land Nail attacks faster. Strength also stacks with Fury of the Fallen: the cited calculation gives an approximately 170.6% combined damage increase while the Knight has one Mask. These interaction details are listed by the Hollow Knight Wiki.
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