The item you’re looking for is Isma’s Tear. Despite the question’s wording, it is an ability, not a charm: it lets the Knight swim in acidic water without harm.
What does Isma’s Tear do?
The game description says: “Swim in acidic waters without coming to any harm.” Isma’s Tear is useful for crossing acid safely, but it is not required to complete the game. The item reference identifies it as an ability.
Where do you find Isma’s Tear?
It is found in Isma’s Grove, within the Royal Waterways, according to the item reference.
What do you need to reach Isma’s Grove?
A secondary walkthrough says the route requires Crystal Heart and that defeating the Dung Defender opens the way. These are guide-reported route requirements; the item reference gives the location but does not confirm those prerequisites.
Quick Recap
Best Value
- Classic side-scrolling action, with all the modern trimmings. Dodge, dash and slash your way through even the most deadly adversaries.
- Tightly tuned 2D controls. Dodge, dash and slash your way through even the most deadly adversaries.
- Forge your own path! The world of Hallownest is expansive and open. Choose which paths you take, which enemies you face and find your own way forward.
- An enormous cast of cute and creepy characters all brought to life with traditional 2D frame-by-frame animation.
- Leap into minds with the Dream Nail. Uncover a whole other side to the characters you meet and the enemies you face.
Rank #4
- Classic side-scrolling action, with all the modern trimmings. Dodge, dash and slash your way through even the most deadly adversaries.
- Tightly tuned 2D controls. Dodge, dash and slash your way through even the most deadly adversaries.
- Forge your own path! The world of Hallownest is expansive and open. Choose which paths you take, which enemies you face and find your own way forward.
- An enormous cast of cute and creepy characters all brought to life with traditional 2D frame-by-frame animation.
- Leap into minds with the Dream Nail. Uncover a whole other side to the characters you meet and the enemies you face.
Rank #3
- Discover the fallen insect kingdom of Pharloom! Explore mossy grottos, gilded cities and misted moors as you ascend to the shining citadel at the top of the world.
- Engage in lethal acrobatic action! Wield a huge suite of deadly moves as you dance between foes in swift, beautiful combat.
- Craft powerful tools! Master an ever-expanding arsenal of weapons, traps, and mechanisms to vanquish your enemies and explore new heights.
- Solve shocking quests! Hunt down rare beasts and solve ancient mysteries to grant the wishes of the downtrodden and restore the kingdom’s hope.
- Face over 200 ferocious foes! Beasts and hunters, monsters and knights. Defeat them all with bravery and skill!
Rank #2
- Classic side-scrolling action, with all the modern trimmings.
- Forge your own path! The world of Hallownest is expansive and open. Choose which paths you take, which enemies you face and find your own way forward.
- Evolve with powerful new skills and abilities! Gain spells, strength and speed. Leap to new heights on ethereal wings. Dash forward in a blazing flash. Blast foes with fiery Soul!
- Equip Charms! Ancient relics that offer bizarre new powers and abilities. Choose your favorites and make your journey unique!
- An enormous cast of cute and creepy characters all brought to life with traditional 2D frame-by-frame animation.
#1 Best Overall
- Classic side-scrolling action, with all the modern trimmings.
- Tightly tuned 2D controls. Dodge, dash and slash your way through even the most deadly adversaries.
- Explore a vast interconnected world of forgotten highways, overgrown wilds and ruined cities.
- Forge your own path! The world of Hallownest is expansive and open. Choose which paths you take, which enemies you face and find your own way forward.
- Evolve with powerful new skills and abilities! Gain spells, strength and speed. Leap to new heights on ethereal wings. Dash forward in a blazing flash. Blast foes with fiery Soul!.Equip Charms! Ancient relics that offer bizarre new powers and abilities. Choose your favourites and make your journey unique!.An enormous cast of cute and creepy characters all brought to life with traditional 2D frame-by-frame animation..
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