
Medic
Purestream
★★★★
Yan
Introduction
Purestream is a 4-star character in Arknights. Purestream's class is Medic. Faction: Yan.
On the combined Arknights tier list Purestream is C tier, 208th of the 410 characters ranked, from where 2 community tier lists put Purestream.
What Purestream does
A
Medic who gives Status Resistance for 4 seconds to everyone she heals.
Healing Waves heals every ally in range for 350% of her ATK at once, and
Lifespring trades heal size for much faster healing.
Profile
Purestream is a female Ægir. Her birthday is Oct 24, and she stands 155cm tall. Purestream is voiced by Li Cheng in Chinese, Kristen Li in English, Marie Miyake in Japanese, and Oh Roah in Korean. 唯@W drew her.
Stories
9Basic Info
[Code Name] Purestream
[Gender] Female
[Combat Experience] None
[Place of Birth] Yan
[Date of Birth] Oct 24
[Race] Ægir
[Height] 155cm
[Infection Status]
Medical tests have confirmed that no infection is present.
Physical Exam
[Physical Strength] Normal
[Mobility] Standard
[Physical Resilience] Normal
[Tactical Acumen] Normal
[Combat Skill] Normal
[Originium Arts Assimilation] Excellent
Profile
Operator Purestream has always been involved in work related to water treatment, and has extensive experience in water purification.
After making contact with Rhodes Island, she passed the examination process and signed on as an Operator.
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 are no other signs of infection. At this time, this operator can be confirmed to be uninfected.
[Cell-Originium Assimilation] 0%
Operator Purestream shows no signs of Oripathy infection.
[Blood Originium-Crystal Density] 0.15u/L
Due to the Operator's line of work in water purification, Purestream often comes in contact with Originium-related pollutants. There is no current risk of infection, but regular check-ups are required, and protective measures should be strengthened.
Archive File 1
When Operator Purestream first joined Rhodes Island, many people did not understand the purpose of the things that she insisted upon.
Such an outcome was not unexpected. After all, Purestream came off as energetic but naive in the eyes of more experienced Operators. Even though she knew a little bit of Originium Arts, she has never experienced the cruelty of bloodshed or the sorrow of lost lives. This cheerful and lively personality may make her easy to get along with, but earning the trust of others is a much higher hurdle.
Back then, very few people understood the importance of the 'environmental conservation' that Purestream was always talking about. After all, between Catastrophes, Oripathy, and Reunion, there were too many threats that were considered more imminent.
But after Purestream quietly cleaned the waterway around the area Rhodes Island was stationed as well as handling the after-treatment of Rhodes Island's sewage in the process, some sharper-eyed Operators began to understand - this youthful water treatment worker may not be so good at combat, but the work she does do is more important than anyone would expect.
Archive File 2
We do not find a lot of information regarding Purestream's hometown.
This is not to say that we ran into many difficulties during our investigation, but after reviewing the material, there simply weren't many things worth keeping. Purestream's hometown is a small, simple village located close to a river. Famous for its pure, clear water, this village has retained many customs that reflect the simplicity of the past. Catastrophes rarely affect this area. Relatively isolated from the outside world, the people here have not had exposure to the Infected, have little conception of Oripathy, and are not wary of outsiders. When asked by our investigators about these subject matters, they were quite open with us, viewing these issues as no big deal.
We found that Operator Purestream worked with Rhodes Island personnel to resolve an issue involving an Originium discharge causing downstream pollution in this local river. After this incident, she became the talk of the town, with many seeing her as a bringer of good fortune. Apparently, she felt the limitations of her own abilities during this incident, and decided to contact Rhodes Island with hopes of expanding her horizons.
Archive File 3
'Conserve water. Yes, it's good to conserve water, but we still get to keep the large bathtub, right?'
Due to the characteristics of her race, if Purestream is in a dry environment for extended periods of time, she may experience skin discomfort. In severe cases, allergic reactions, chafing, or other related symptoms may occur. Therefore, Purestream always carries a small spray bottle of purified water with her. She can often be seen taking out this bottle to spray water over her face. Rhodes Island's well-equipped bath facility has quickly become one of her favorite places.
Purestream holds herself to strict standards in the conservation of resources, her conviction only faltering when it comes to her bathing problem, for which she appears ashamed and apologetic about.
For others, this is perfectly understandable, for nobody is perfect. Despite that, Purestream has expressed remorse for her actions and has even set up a rule that limits her to three baths a day.
Because of this restriction, she makes sure to thoroughly enjoy each session. When she completely submerges herself into the water, the young girl is so happy that she sometimes can't help but to sing.
[Classified Records]
Regarding Operator Purestream's race, it is difficult to find out where they originated from, but we may be able to glean some clues from some local folk songs.
Her true hometown must be very far, far away, in a distant land.
Archive File 4
'To be honest, her background and experience are as pure as the water she treats, and there are not many things worth delving into.'
'Is that so? Since you were gone for so long, I thought... Wait, what's that in your hand?'
'Hm? This? It's a local delicacy, some kind of pickled game.'
'...What about all that stuff in your backpack?'
'Oh? Your sense of smell is way too keen if you noticed that! If you promise not to tell Dr. Kal'tsit, I'll share some with you. These are some frozen specialty dishes that I got from a local store. Luckily, my ice-based Originium Arts came in handy, or I wouldn't have been able to bring these back.'
'...What are you chewing on this time...'
'Ah... I actually have no idea what this is. It's supposed to be some kind of home cooking, but I can't tell what it actually is... But, it's pretty good, and I have some more if you want to try?'
'What's the matter? Doesn't suit your taste? That's weird... I thought it was pretty pungent...'
'...Half.'
'Huh? What?'
'If you don't want Dr. Kal'tsit to find out that all you were doing on your trip was eating, give me half your haul. Don't worry, I'll pay.'
'Huh?! Isn't that a bit too cutthroat?!'
--A conversation between two investigators, as recorded by a hallway security camera
If she cordially invites you to go visit her hometown, don't refuse the opportunity. Don't even give yourself the chance to regret it later.
Promotion Record
Getting people to understand you is sometimes more valuable than a promotion and the salary that comes with it.
However, getting a salary increase is also important. Whatever you do, be very careful of touting lip service while ignoring the pay.
Stats
- HP391st of 4551,365
- ATK359th of 455454
- DEF381st of 455118
- RES132nd of 45210
- Block1
- DP cost226th of 44619
- Redeploy380th of 45580s
- 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: 748ATK: 159DEF: 51RES: 10Block: 1DP: 17Redeploy: 80Interval: 2.85
- Elite 0 Lv. 45HP: 985ATK: 261DEF: 75RES: 10Block: 1DP: 17Redeploy: 80Interval: 2.85
- Elite 1 Lv. 60HP: 1173ATK: 363DEF: 94RES: 10Block: 1DP: 19Redeploy: 80Interval: 2.85
- Elite 2 Lv. 70HP: 1365ATK: 454DEF: 118RES: 10Block: 1DP: 19Redeploy: 80Interval: 2.85
Base values before trust, potentials and modules. Full trust adds HP +150, ATK +35.
Trait
- Has a large healing range, but the healing amount on farther targets is reduced to 80%
Skills
2
Healing Waves
Manual trigger · Auto recovery · Unlocks at Elite 0LevelImmediately restores the HP of all allies within range by 350% of ATK.
- SP cost
- 20
- Initial SP
- 10

Lifespring
Manual trigger · Auto recovery · Unlocks at Elite 1LevelAttack Interval is greatly reduced, and each attack restores the HP of an injured allied unit within range by 50% of ATK.
- SP cost
- 60
- Initial SP
- 30
- Duration
- 25s
Talents
1Rapid Restoration
- Elite 1
- Targets healed by this unit gain status resistance for 2 seconds
- Elite 2
- Targets healed by this unit gain status resistance for 4 seconds
Potentials
- Potential 2
- DP Cost -1
- Potential 3
- Redeployment Time -4 sec
- Potential 4
- ATK +23
- Potential 5
- Redeployment Time -6 sec
- Potential 6
- DP Cost -1
Modules
1
'The River's Lingering Charm' (WAH-Y)
Unlocks at Elite 2 Lv. 40StageStatsTraitTalent- Stage 1Stats: ATK +20, DEF +20Trait: Has a large healing range and healing is no longer reduced for distant targets
- Stage 2Stats: ATK +26, DEF +26Trait: Has a large healing range and healing is no longer reduced for distant targetsTalent: +10% Skill healing effectiveness
- Stage 3Stats: ATK +32, DEF +32Trait: Has a large healing range and healing is no longer reduced for distant targetsTalent: +20% Skill healing effectiveness
To unlock
- Have Purestream use Lifespring a total of 5 times (excluding Support Units)
- Clear Main Theme 3-7 with a 3-star rating; you must deploy your own Purestream, and cannot include any Medic Operators as members
Module record
So I've lost my talisman. I've been looking for ages, and I still can't find it. It was only a little thing I bought while carrying out a mission in Yan, but the local said it'd been blessed at the temple. Someone tells me I can go and ask Purestream. Purestream... I'm not too familiar with the name. Maybe it's a new operator handling lost and found at Logistics?
It's not in my dorm...
Or the meeting room...
I find her at the baths. She's just finished repair work, and now she's, well, bathing. I can even hear her singing from outside the door. It's loud, clear and perfect... but don't you feel icky bathing for that long?
'Sorry, sorry, I know I kept you waiting.'
'Rhodes Island's sewage work is up to the task, but they've really been overlooking cleaning the filtration system itself. The vast majority of areas have blockages. You need to get into them frequently! All I can do is hang on until the whole cleaning job's done before I... heheh.'
'Is this your charm? Come and take a look.'
The girl absentmindedly talks as she opens a bag. Aside from my talisman, I can see marbles, hair clips, test tubes, and even an ammo magazine...
'Did you... find all of these in the sewage filtration system?'
'Yup. It was covered in mud when I found it, absolutely filthy, but I've already thoroughly cleaned it.'
I'm about to ask 'how could it have gotten there,' but I hold it back. I should be asking myself that...
Later, I'm chatting with a friend in Engineering about the landship breaking down and getting repaired. Nobody would've called the problem being the sewage systems. Operator Purestream took on the cleanup task all alone after only a day of her job, and she'd spent two whole days inside the filthy inner filtration system... blockages in a few specific areas were the 'main culprits,' all the 'treasures' we'd accidentally lost and couldn't find. I remember Purestream sort of shyly smiled when I told her thanks, and she just urged me to 'take care from now on,' giving me a precautions while she was at it. Water could flush everything away, so we'd gotten used to just twisting taps and pushing on valves, simple as that. It was precisely because water could flush everything that we never knew how dirty it'd gotten, somewhere out of our sights.
I hear Purestream's in charge of Rhodes Island landship sewage work now. I didn't know what she liked, so all I could figure was to buy some scented soap and send it to her. I only found out later she'd gotten piles of it by that point. I guess I wasn't the only one who wanted to tell her thank you., As related by an operator, extracted from a periodic evaluation of Purestream following her onboarding
Base skills
2
Clean Energy
Power Plant · Elite 0When this Operator is assigned to a Power Plant, increases the drone recovery rate by +15%

Renewable Energy
Factory · Elite 1When this Operator is assigned to a Factory, every Trading Post makes the Factory's Precious Metal formula related productivity +20%
Outfits
3
Elite 1
Default Outfit
Art by 唯@W

Elite 2
Default Outfit
Art by 唯@W

Yearly Present
0011 Craft/X
Art by 直立行走
Event Reward
Voice lines
38Show all 38 lines
- Appointed as Assistant
- Smiling can help you feel revitalized. Why don't you try smiling, Doctor.
- Talk 1
- Rhodes Island shouldn't be like those black-hearted corporations, right? Lungmen Industrial Waste Disposal License, Lungmen City Sewage Permit... Well, it seems like there are no problems with your certification, and the sewage treatment seems good enough... It's good that you're a law-abiding organization!
- Talk 2
- Woah, this water tastes amazing~! It's cool and sweet, just like the springs back in my hometown... Where's the water source? How is it filtered? What are you using to filter it? Please tell me quickly, Doctor!
- Talk 3
- There are signs of excessive wastewater discharge this mon-- Huh? Did I take too many baths again? ...Oh no, I must reflect upon my behavior!
- Talk after Promotion 1
- I love my hometown! Although it's not as lively in the country as it is in the city, and daily life isn't as comfortable, the water there is cool and delicious, and the air is always fresh. Hehe, these are sometimes hard to come by in the city!
- Talk after Promotion 2
- The pollution near the city is getting worse and worse. Earlier, we even had problems with the water supply in my hometown, and resolving that situation required a lot of effort. While Catastrophes pose a very clear threat to us, pollution will also erode away at our habitable spaces! Therefore, protecting our environment is also of great importance!
- Talk after Trust Increase 1
- Heave, ho! That should be the last shoe... Got it! Phew, now, this waterway will be much cleaner, and my daily efforts here won't go to waste! Thank you for accompanying me, Doctor!
- Talk after Trust Increase 2
- There is a legend among my people that we came from a place far, far away. Now that there are fewer and fewer of us, nobody seems to know where we came from, or where we are going...
- Talk after Trust Increase 3
- Back in my hometown during harvest season, each family will make lots and lots of delicious food! Braised, sweet and sour, steamed, fried, marinated, anything you can imagine! Doctor, why don't we go visit together? The people there are very hospitable~
- Idle
- Ugh... So dry... I want to soak in a bath...
- Onboard
- Hello, I am the municipal waterway cleaner, codename Purestream! From now on, I will handle the water treatment and sanitation of this ship, so please rest assured! Oh, these are pickled vegetables from my hometown. Everyone is welcome to try some, I assure you, they're delicious!
- Watching Battle Record
- If the purpose is to gain experience, wouldn't it be faster to put everything into practice?
- Promotion 1
- Am I getting a raise? With this promotion and salary increase, I'm well on my way to the top! Hehe, I'll have to tell everyone back home the good news~
- Promotion 2
- While there is a difference in urgency between visible threats and less evident threats, they are both dangerous to us! I'm glad you understand, Doctor.
- Added to Squad
- No problem, just leave it to me!
- Appointed as Squad Leader
- Such an important task... I'll do my best!
- Depart
- Rhodes Island Water Treatment Team, heading out!
- Begin Operation
- Surprise inspection! That punk just poured paint down the sink! Get him!
- Selecting Operator 1
- A fight? Alright! Lemme Roll up my sleeves… Oh, I don't have sleeves.
- Selecting Operator 2
- Woah, they're really fighting!
- Deployment 1
- Cleaning work is my specialty!
- Deployment 2
- Water delivery!
- In Battle 1
- Breach and flip!
- In Battle 2
- That's unauthorized discharge of sewage!
- In Battle 3
- Water works to the benefit of all.
- In Battle 4
- Did that splash of cool water wake you up?
- 4-star Result
- No more contaminants! Very good, this mission was a great success~
- 3-star Result
- Operation complete! But we have to be diligent with the cleanup.
- Sub 3-star Result
- Hey, where'd the enemy run off to? I-I can't find them!
- Operation Failure
- The situation is looking bad, but we have nothing to fear as long as we stay strong! Let's fall back for now?
- Assigned to Facility
- I hope I can get a nice, big bathtub.
- Tap
- Hmm?
- Trust Tap
- Let me tell you a secret, I can swim upright!
- Title
- Arknights.
- New Year's blessing
- Doctor, Happy New Year! Mom and Dad sent me some pickles they made. I've checked the calendar, now's the best time to eat them! Quick, try some, and I'll fetch some for everyone else too. Hehe, Our village might not be famous, but even city people know this kind of pickle!
- Greeting
- Good morning, Doctor! Would you like a cup of cool, refreshing spring water?
- Birthday
- Happy birthday, Doctor! This is a water purifier I developed myself. You connect it to the tap, and it lets you directly drink the water that comes out! Oh, of course, I'll keep working on new filter models for you to replace it with. I've got this all planned out, and the next step is, getting everyone at Rhodes Island to use it!
- Anniversary Celebration
- I often have this sinking feeling that my own power is too little, but if I can change a company as big as Rhodes Island by myself, then there have to be more people like me across the land. As long as we all keep up our own strives, the future will be better, won't it?
Upgrade costs
Open in the plannerPromotion
- Elite 1
Medic Chip ×3
Orirock Cube ×1
Sugar ×1
LMD ×15,000 - Elite 2
Medic Chip Pack ×5
Integrated Device ×11
Coagulating Gel ×9
LMD ×60,000
Skill levels
- Lv. 2
Skill Summary - 1 ×2 - Lv. 3
Skill Summary - 1 ×2
Orirock ×5 - Lv. 4
Skill Summary - 2 ×3
Sugar ×2 - Lv. 5
Skill Summary - 2 ×3
Polyester ×3 - Lv. 6
Skill Summary - 2 ×3
Manganese Ore ×2 - Lv. 7
Skill Summary - 3 ×4
Grindstone ×2
Mastery: Healing Waves
- M1
Skill Summary - 3 ×2
Polymerized Gel ×1
Orirock Cluster ×6 - M2
Skill Summary - 3 ×4
Grindstone Pentahydrate ×2
White Horse Kohl ×3 - M3
Skill Summary - 3 ×6
D32 Steel ×2
Optimized Device ×2
Mastery: Lifespring
- M1
Skill Summary - 3 ×2
Oriron Block ×1
Incandescent Alloy ×3 - M2
Skill Summary - 3 ×4
RMA70-24 ×2
Manganese Trihydrate ×2 - M3
Skill Summary - 3 ×6
Bipolar Nanoflake ×2
Keton Colloid ×2
Module: 'The River's Lingering Charm' (WAH-Y)
- Stage 1
Module Data Block ×1
Polyester Pack ×4
LMD ×20,000 - Stage 2
Module Data Block ×1
Data Supplement Stick ×15
Aketon ×5
LMD ×25,000 - Stage 3
Module Data Block ×1
Data Supplement Instrument ×5
Manganese Ore ×6
LMD ×30,000
How to get Purestream
Limited Gift Pack
Art
















