
Medic
Chestnut
★★★★
Rhodes Island
Introduction
Chestnut is a 4-star character in Arknights. Chestnut's class is Medic. Faction: Rhodes Island.
On the combined Arknights tier list Chestnut is D tier, 381st of the 410 characters ranked, from where 2 community tier lists put Chestnut.
What Chestnut does
A
Medic focused on Elemental Injury. Her talent adds 23% Elemental Injury recovery on ground units, Little By Little stores two heals with 300% Elemental Injury recovery, and
Rising Earth trades range for +130 ASPD and stronger repeat heals on one target.
Profile
Chestnut is a male Durin. His birthday is Mar 15, and he stands 132cm tall. Chestnut is voiced by ZhiAn in Chinese, Chris Naoki Lee in English, Shoya Chiba in Japanese, and Hong Seung-hyo in Korean. 树豚 drew him.
Stories
9Basic Info
[Code Name] Chestnut
[Gender] Male
[Combat Experience] None
[Place of Birth] Undisclosed
[Date of Birth] Mar 15
[Race] Durin
[Height] 132cm
[Infection Status]
Medical tests have confirmed that no infection is present.
Physical Exam
[Physical Strength] Normal
[Mobility] Standard
[Physical Resilience] Standard
[Tactical Acumen] Standard
[Combat Skill] Normal
[Originium Arts Assimilation] Standard
Profile
Chestnut, a geological surveyor of his Durin tribe. A quiet, introverted man, he is adept at using minerals to provide medical treatment with his Originium Arts, and he chose to become a doctor when he came aboveground.
Clinical Analysis
Imaging tests reveal clear, normal outlines of internal organs, and no abnormal shadows have been detected. Originium granules have not been detected in the circulatory system and there is no sign of infection. At this time, the operator is believed to be uninfected.
[Cell-Originium Assimilation] 0%
There ain't enough Durins here! Should kidnap a few next time and run some tests on them.
[Blood Originium-Crystal Density] 0.12u/L
Very healthy!
Archive File 1
A Durin man with a short stature. He claims to be a fully grown adult, but like all Durins, there's no way to tell for sure just by looking.
From what Chestnut told us, the Druins often use all kinds of crystal lights for lighting, and he has long had an interest in these colorful crystals, even hoping that he could one day mine these beautiful rocks himself. Dreams are always the best motivator, and even though most Durins are lively in nature and dislike confinement, to make his small childhood wish come true, Chestnut learned every last detail he could from the adults in his tribe about these ores. When he dug his first crystal out of the ground and unleashed its colorful radiance, he excitedly made a small lamp out of this ore. Even though this small crystal lamp isn't particularly well-made and its light's color isn't especially vivid, it is still one of Chestnut's favorite possessions.
When they spend their entire lives living underground, it is very important to the Durins to continue to build and expand their underground cities. They must first survey the geological features of their destination to determine whether it is suitable for habitation. The adults who taught Chestnut his geological knowledge became his teacher, and in this underground world where there isn't a clear concept of occupation, they formed a close relationship built upon knowledge and enthusiasm. Whenever the city had to be expanded, Chestnut and his teachers would put all their knowledge and power to use to repay their homeland.
After Chestnut made it to the surface, he changed course and instead walked the path of a doctor. Although his teachers and friends couldn't understand his fixation on the surface, they took notice of how he persisted down this path quietly and decided to support the boy who's so fond of researching his interests. After all, there are many ways that one can live. As long as you are happy and you aren't affecting anyone else, who could say that's the wrong way to live?
He gave me a small ore as a present and said it's unique to the Durins. That's so cute!
—Note from the writer
Archive File 2
When we asked him why he didn't continue his research into ores and instead became a medical operator, Chestnut told us about his past. The Durins need to regularly trade with tribes that live elsewhere, and so they generally have friendly relationships with each other, and large scale bloodshed is extremely rare. Which is why he thought of war as something very far removed from him.
One day, a Catastrophe occurred on the surface directly above Chestnut's homeland by coincidence and triggered a larger scale cave-in, which destroyed a substantial portion of the underground city. Although the situation on the surface was unclear, the underground structure had already been altered. Chestnut understood that his homeland needed his help. He traversed the fissures opened by the Catastrophe, collected samples and ores, and recorded data that could affect his homeland. By the time he was finished with his work, half a year had passed. His tribe repaired much of the rail tracks and elevators thanks to the data that he and the other prospectors collected, and the only things left could only be healed with the passing time and continued effort. Having seen everything turn out so successfully, Chestnut finally had the time to explore the question he had at the very beginning: 'Just what happened on the surface?'
When he was still a kid, Chestnut was already struck with admiration of the surface, having heard how vast and wide it was on the surface from adults that had been there. He was perhaps even more of a fan of the surface than the unique landscapes underground. Chestnut worked on his plan to climb aboveground day after day, and even though reality wasn't quite how he imagined, he didn't let it get to him. Ignoring the fissures that led aboveground and the glimpses of the blue sky above during his geological surveys, Chestnut instead turned his attention to the ground under his feet.
With the way things are now, Chestnut decided to take the chance to do some traveling. He rode the newly repaired elevators traversed layers after layers of dark but differing geological cross sections, and finally made it above ground for the first time. He kept going, and aside from that narrow blue above he ignored during his surveys, he saw a lot of landscapes that even the tribesmen who returned from surface never saw: a large, bottomless valley; a wide, calm lake; and strange, wind-eroded rocks. Yet he also saw something that's the furthest away from beauty for the first time: the land-dwellers' blood-soaked wars. After everything came to an end, Chestnut asked them about the cause. Apparently, a group of bandits attempted to steal the farmers' harvest, leading them to fight back. Born and raised in the underground where items are traded peacefully, he didn't understand why this happened, but he felt there was something for him to do, and so he raised his staff and offered this group of men a helping hand.
Although his hometown is habitable after it was repaired by his tribesmen, Chestnut has already made the decision to remain on the surface. He chose to follow his childhood dream. What's more, there are a lot more people here who need his help.
Archive File 3
Since he joined Rhodes Island, Chestnut has continued further and further down the path of a doctor. He started to take field operations one after another, upholding his responsibility at each and every meaningful and meaningless conflict along the way. Most of our operators are very fond of this calm doctor, and Chestnut himself also treasures everyone's trust greatly, leading him to devote himself in his work to save his patients more rapidly and attentively.
That said, the operators and Chestnut himself both overlooked one thing during his onerous missions, and that's how humans must, aside from work, also pay attention to how they feel in their hearts. Chestnut encountered a problem that almost every doctor encounters at some point during their practice: It seems that simply being a doctor doesn't affect much.
One day, after the field operations squad had completed all the preparations for their evacuation, they found Chestnut standing on a patch of muddy field when they called roll. He didn't respond to their calls, even casting his Originium Arts into the sky in a retaliatory way.
After he got back to the landship, Chestnut told our Medical Department's operators his misgivings: With pain caused by sickness, he believes that as long as he keeps putting in the effort, even the most stubborn of diseases can be defeated. But after he came to the surface, he realized just how many of the injured were wounded by conflict. Their pains weren't caused by disease, but something much more complicated that he is unsure of. He can treat them, but he cannot stop those more complicated reasons from happening. In particular, through his work in Rhodes Island, he has had much more chances to see for himself how ugly war is.
Chestnut started to crumple.
He looked at this strange, beautiful world and began to reminisce his homeland.
And so, Rhodes Island approved his leave request.
Archive File 4
Returning to the familiar yet strange underground, Chestnut told his tribe's curious children about the things he saw on the surface. It felt as though he made it back to his childhood. Everything was the same, only that, this time, he was the adult that came back from the surface, yet he didn't feel he deserved the children's admiration with the way he was.
During his vacation, Chestnut started to work his old job of geological prospecting and crystal ore mining again. On his free time, he visited the waterfall he used to visit as a kid and compare his height to the fluorescent mushrooms there. This slow-paced life gave him more time to think: What is it that I wanted to do in the very beginning? What am I so distressed about? Is the thing that's giving me all this anxiety something I can solve if I put myself to it?
Just like when he worked as a geological prospector to help his tribesmen, although a Catastrophe striking his homeland was vexing, he knew there was nothing he could do to stop Catastrophes. In that case, saving others as a doctor should be no different. He knew there was nothing he could do to stop the conflicts between people, and he must accept that.
Chestnut spent over a month to carefully think about all this. He didn't know if this was just a fake sense of optimism for self consolation, but he felt he couldn't let what he had no control over to drag him down any longer. He chose to return to work, as only then will he be able to find the right way to solve these problems.
When Chestnut returned to Rhodes Island, it was obvious that he now had a much firmer conviction. Although psychological scars cannot be completely erased within such a short amount of time, everyone at Rhodes Island is happy to see him moving forward once again.
Promotion Record
To tell the truth, when Chestnut first told us why he came to us, we thought it was both sad and hilarious... Although the surface does see its fair share of Durin visitors, most of them only come up because they think it's fun up here instead of trying to make a living to feed their families. Chestnut said that he actually asked around and learned what things are like on the surface. He then decided to follow in our footsteps and looked for a job at a hospital, only to be treated like a kid. He managed to find a few that knew about the Durins, but all of them turned him away owing to concerns about their patients. You can't exactly blame them. If I got sick, and the doctor at the hospital turned out to be this short, I would think there's something wrong with the hospital, too.
That's why things really were pretty hard for him. He even said that he almost cried when he found out we already had not one, but two Durins here.
Stats
- HP426th of 4551,137
- ATK396th of 455389
- DEF420th of 455101
- RES132nd of 45210
- Block1
- DP cost121st of 44614
- Redeploy70s
- Attack interval387th of 4552.85s
At Elite 2, level 70, before trust, potentials and modules. Each bar is measured against the highest value in the Arknights roster, and the place is out of every character with that stat, lowest first for DP cost, Redeploy and Attack interval.
By promotion
- Elite 0 Lv. 1HP: 623ATK: 136DEF: 44RES: 10Block: 1DP: 12Redeploy: 70Interval: 2.85
- Elite 0 Lv. 45HP: 820ATK: 223DEF: 64RES: 10Block: 1DP: 12Redeploy: 70Interval: 2.85
- Elite 1 Lv. 60HP: 977ATK: 311DEF: 80RES: 10Block: 1DP: 14Redeploy: 70Interval: 2.85
- Elite 2 Lv. 70HP: 1137ATK: 389DEF: 101RES: 10Block: 1DP: 14Redeploy: 70Interval: 2.85
Base values before trust, potentials and modules. Full trust adds HP +100, ATK +35.
Trait
- Restores the HP of allied units and recovers Elemental Injury by 50% of ATK (can recover Elemental Injury of unhurt allied units)
Skills
2
Little by Little
Manual trigger · Auto recovery · Unlocks at Elite 0LevelPerform a heal with Elemental Injury recovery increased to 300% Can store 2 charges
- SP cost
- 10
- Initial SP
- 8
- Charges
- 2

Rising Earth
Manual trigger · Auto recovery · Unlocks at Elite 1LevelAttack Range reduced; ASPD +130; when healing the same target multiple times, healing effect and Elemental Injury recovery are increased to 150%
- SP cost
- 70
- Initial SP
- 40
- Duration
- 35s
Talents
1Solidly Grounded
- Elite 1
- Elemental Injury recovery +10% when healing ground units
- Elite 1 · Potential 5
- Elemental Injury recovery +13% (+3%) when healing ground units
- Elite 2
- Elemental Injury recovery +20% when healing ground units
- Elite 2 · Potential 5
- Elemental Injury recovery +23%(+3%) when healing ground units
Potentials
- Potential 2
- DP Cost -1
- Potential 3
- Redeployment Time -4 sec
- Potential 4
- ATK +15
- Potential 5
- Improves Talent
- Potential 6
- DP Cost -1
Modules
1
Ground Journey Commemorative Light (WDM-X)
Unlocks at Elite 2 Lv. 40StageStatsTraitTalent- Stage 1Stats: HP +50, ATK +15Trait: Restores the HP of allied units and recovers Elemental Injury by 60% of ATK (can recover Elemental Injury of unhurt allied units)
- Stage 2Stats: HP +60, ATK +24Trait: Restores the HP of allied units and recovers Elemental Injury by 60% of ATK (can recover Elemental Injury of unhurt allied units)Talent: Elemental Injury recovery +25% when healing ground units
- Stage 3Stats: HP +70, ATK +30Trait: Restores the HP of allied units and recovers Elemental Injury by 60% of ATK (can recover Elemental Injury of unhurt allied units)Talent: Elemental Injury recovery +27% when healing ground units
To unlock
- Complete a total of 5 battles; You must deploy your own Chestnut, and unleash Rising Earth at least 1 time in each battle
- Clear Under Tides SV-3 with a 3-star rating; You must deploy your own Chestnut, and cannot include any other Medic Operators as members
Module record
A shard of Kjerag ice crystal. Chestnut found himself comfortably seated in a baby carrier on a burdenbeast, snugly wrapped in a coat he 'rented' from a shopkeeper. Well, the smallest size fit him like a trailing robe, prompting the generous shopkeeper to let him keep it for free. Upon reaching the summit at dawn, golden sunlight filtered through the ice crystal onto his face. Lifted high by the jubilant crowd, he basked in their cheers.
A piece of Rim Billiton pyrite. Coming to observe the geysers, Chestnut was greeted with an unexpected subterranean eruption followed by a mine collapse. Amid the chaos, he pushed through the fleeing masses, brandishing his medical license as he advanced against the current. After a long night of aid, he declined the grimy coins offered by the grateful miners, accepting instead a pristine piece of pyrite.
A fossilized tree root from Sami. Traveling aimlessly to the far north, Chestnut clutched the fossil and sought a local diviner. They interpreted the ancient tree root, hidden for millennia, to say: 'The expansive land surpasses your wildest dreams. Never cease your journey.'
An uncut jade from Yan. At a bustling food stall, Chestnut used money pawned from the jade to treat two feuding groups of youths to local delicacies. Post-meal, the young men reconciled, chipped in for the jade back. If only all conflicts could resolve so straightforwardly, thought Chestnut, wishing to heal rather than witness needless strife.
A chunk of amber. In Columbia, Chestnut stumbled upon a piece of amber encasing an insect. Earthspirit and Eyjafjalla scrutinized it, revealing that the creature hailed from Sargon, mystified at its presence in Columbia. They stood on the Rhodes Island landship, traversing the desert towards Sargon's boundless sands.
Chestnut pocketed the amber, realizing it was time to return home.
Back underground, he revisited the familiar stone falls. Clumps of fluorescent mushrooms adorned the moist rock faces. Chestnut stood on his toes, measuring himself against the fungi. Little heads clustered around, eager for tales of his surface stories.
A line of ore lamps shed gentle light on curious gazes, reminiscent of his childhood days, though now he was the storyteller. Chestnut grinned.
'Every one of these minerals come from distinct landscapes. Which story would you like to hear first?'
Base skills
2
Standardization α
Factory · Elite 0When this Operator is assigned to a Factory, productivity +15%

Geology α
Factory · Elite 1When this Operator is assigned to a Factory, Originium formula related productivity +30%
Outfits
3
Elite 1
Default Outfit
Art by 树豚

Elite 2
Default Outfit
Art by 树豚

Holiday HDm57
Coral Coast/XII
Art by 树豚
Event Gift
Voice lines
38Show all 38 lines
- Appointed as Assistant
- Ummm... Doctor, the documents on the shelves are a bit messy. Back home, I had a tabletop assistant device that automatically organized our files. All you had to do was stick the files in, then it would package and seal them. I think you should get something like that too.
- Talk 1
- Wanting to see new places is a pretty common reason for leaving home, isn't it? To be honest, every time I climb a tall mountain or dive into a deep lake, I feel like I've made the right choice.
- Talk 2
- Doctor, are you a fan of wide-open landscapes? For example, imagine yourself next to a lake, watching the surface of the water rise and fall, the clouds gathering and dispersing, the sun slowly drooping behind the horizon, painting the lake a dazzling gold... That's the kind of scenery I love.
- Talk 3
- A Catastrophe? Are we really going to cruise past a Catastrophe?! I didn't get to see the last one up close, so I can't let this opportunity slip by! I'm going out right, What? The door to the bridge is locked?
- Talk after Promotion 1
- My staff turns minerals into healing agents, sometimes with other special effects depending on the type of material used. You don't believe me...? I'm being serious here, Doctor.
- Talk after Promotion 2
- I've helped more and more people, which gives me a sense of accomplishment. But as a physician, I still wish there were fewer and fewer casualties from people fighting each other.
- Talk after Trust Increase 1
- Doctor, have you seen fluorescent mushrooms before? There used to be a bunch of them growing by the rocks near the waterfall I played at as a kid. Some of them grew taller than the tallest person in the clan, serving as lamps to bring light to places where the city could not reach.
- Talk after Trust Increase 2
- My original reason for coming above ground was simple: I wanted to survey the geography around my homeland, and soak up the sights and sounds along the way. Now I travel further and further not only for the sights I haven't seen, but also for the people who need my help.
- Talk after Trust Increase 3
- Doctor, why do people bloody themselves fighting each other? I can treat a wound or two, maybe even a lot more than that, but what can I do as a physician if the people don't change their minds?
- Idle
- Your desk is still a bit messy. Let me clean things up for you.
- Onboard
- Pleased to meet you, Dr.{@nickname}. This is for you. It's a specimen box made from gemstones I collected, lapis lazuli, turquoise, plum tourmaline, chalcedony…
- Watching Battle Record
- The lens doesn't move, Doctor. Do you think if we gave this to a Durin operator, they'd be able to upgrade it to automatically follow the subject? If it's my idea, it's my responsibility? Ughh…
- Promotion 1
- I... never expected to be promoted so soon! I'll carry on my research into the curative properties of gemstones!
- Promotion 2
- I left home so I could realize my dreams, I gained recognition here, and found a place where I could learn even more from my peers in the Medical Department. I've truly found a good job.
- Added to Squad
- Whenever I think of my squadmates getting hurt in battle, I start to feel uneasy.
- Appointed as Squad Leader
- I don't like war, but that's my personal feelings. As a squad leader, I vow to uphold my responsibility.
- Depart
- Be careful, everyone! Nothing's more important than your own safety!
- Begin Operation
- Is this really the only way to settle our problems?
- Selecting Operator 1
- Waiting for your command.
- Selecting Operator 2
- I trust the Doctor will lead us to victory.
- Deployment 1
- I'll heal your wounds and dull your pain.
- Deployment 2
- Don't worry, I've got your back.
- In Battle 1
- If you feel unwell, report it right away!
- In Battle 2
- Don't push yourself too hard in battle!
- In Battle 3
- Feel any better?
- In Battle 4
- Relax, tense muscles will only make your treatment more difficult.
- 4-star Result
- The more prep work we do, the better the outcome we'll see. This is all thanks to everyone's hard work.
- 3-star Result
- Now's a great time to watch the sunset. Let's head over there and sit down for a spell.
- Sub 3-star Result
- We fight now for a peaceful future…? If only our enemies wanted the same.
- Operation Failure
- Run, I'll cover you!
- Assigned to Facility
- The decor here is really different from back home.
- Tap
- Hm? Who is it? Oh, it's you, Doctor.
- Trust Tap
- I'm putting together a new specimen box, Doctor. Want to see it?
- Title
- Arknights.
- New Year's blessing
- Woah, it's nice to see everyone coming together to celebrate! But, I suddenly realized, it's a darned shame this occasion only comes once a year!
- Greeting
- Doctor, wanna head up to the deck for some fresh air?
- Birthday
- This crystal here can soothe your mind. Try putting it on when you're feeling bad. Oh, and when you're feeling good too, sure! I took it when I left home, and it's yours now. Happy birthday, Doctor.
- Anniversary Celebration
- I've been here at Rhodes Island a while now, done a lotta work with you and the folks in Medical, helped a bunch of people. Sitting here mulling it over now, I've gained a ton of precious experience I never picked up on before. I'll remember this, keep it all with me, right in here.
Upgrade costs
Open in the plannerPromotion
- Elite 1
Medic Chip ×3
Polyester ×1
Device ×1
LMD ×15,000 - Elite 2
Medic Chip Pack ×5
Loxic Kohl ×20
Incandescent Alloy ×8
LMD ×60,000
Skill levels
- Lv. 2
Skill Summary - 1 ×2 - Lv. 3
Skill Summary - 1 ×2
Sugar Substitute ×4 - Lv. 4
Skill Summary - 2 ×3
Polyester ×2 - Lv. 5
Skill Summary - 2 ×3
Oriron ×2 - Lv. 6
Skill Summary - 2 ×3
Crystalline Component ×2 - Lv. 7
Skill Summary - 3 ×4
Orirock Cluster ×3
Mastery: Little by Little
- M1
Skill Summary - 3 ×2
Refined Solvent ×1
RMA70-12 ×3 - M2
Skill Summary - 3 ×4
Manganese Trihydrate ×2
Cutting Fluid Solution ×2 - M3
Skill Summary - 3 ×6
Bipolar Nanoflake ×2
Refined Solvent ×2
Mastery: Rising Earth
- M1
Skill Summary - 3 ×2
Orirock Concentration ×1
Grindstone ×4 - M2
Skill Summary - 3 ×4
Grindstone Pentahydrate ×2
White Horse Kohl ×3 - M3
Skill Summary - 3 ×6
Polymerization Preparation ×2
Incandescent Alloy Block ×2
Module: Ground Journey Commemorative Light (WDM-X)
- Stage 1
Module Data Block ×1
RMA70-12 ×4
LMD ×20,000 - Stage 2
Module Data Block ×1
Data Supplement Stick ×15
Semi-Synthetic Solvent ×5
LMD ×25,000 - Stage 3
Module Data Block ×1
Data Supplement Instrument ×5
Sugar Pack ×6
LMD ×30,000
How to get Chestnut
Recruitment & Headhunting
Art
















