
Caster
Eyjafjalla
★★★★★★
Leithanien
Introduction
Eyjafjalla is a 6-star character in Arknights. Eyjafjalla's class is Caster. Faction: Leithanien.
On the combined Arknights tier list Eyjafjalla is A tier, 25th of the 410 characters ranked, from where 3 community tier lists put Eyjafjalla.
What Eyjafjalla does
An area
Caster whose
Volcano adds 130% ATK and more range and showers up to six enemies with lava at a much faster attack rate. She also gives every
Caster 16% ATK while deployed and starts with 10 to 18 SP.
Eyjafjalla's banners
All banners- 20 October 2026 to 3 November 2026Rare Operators useful in all kinds of stages
- 30 June 2026 to 14 July 2026 Celebration - Kernel
- 10 March 2026 to 24 March 2026Rare Operators useful in all kinds of stages
- 29 July 2025 to 12 August 2025Rare Operators useful in all kinds of stages
- 1 July 2025 to 15 July 2025 Celebration - Kernel
- 6 May 2025 to 20 May 2025Rare Operators useful in all kinds of stages
- 25 March 2025 to 8 April 2025Rare Operators useful in all kinds of stages
- 10 September 2024 to 24 September 2024Rare Operators useful in all kinds of stages
- 30 July 2024 to 13 August 2024Rare Operators useful in all kinds of stages
- 2 July 2024 to 16 July 2024 Celebration - Kernel
- 13 February 2024 to 27 February 2024Rare Operators useful in all kinds of stages
- 16 January 2024 to 30 January 2024Rare Operators useful in all kinds of stages
- 5 December 2023 to 19 December 2023Rare Operators useful in all kinds of stages
- 14 July 2023 to 28 July 2023Celebration & Link-Up
- 15 July 2022 to 29 July 2022Celebrate & Recollect
Profile
Eyjafjalla is a female Caprinae. Her birthday is Oct. 18, and she stands 145cm tall. Eyjafjalla is voiced by Cool in Chinese, Hollie Taylor in English, Risa Taneda in Japanese, and Kim Ha-ru in Korean. Anmi drew her.
Stories
9Basic Info
[Code Name] Eyjafjalla
[Gender] Female
[Combat Experience] None
[Place of Birth] Leithanien
[Date of Birth] Oct. 18
[Race] Caprinae
[Height] 145cm
[Infection Status]
Originium crystals distributed across surface of body, confirmed Infected by medical examination.
Physical Exam
[Physical Strength] Normal
[Mobility] Normal
[Physical Resilience] Normal
[Tactical Acumen] Normal
[Combat Skill] Normal
[Originium Arts Assimilation] Outstanding
Profile
Eyjafjalla, volcanologist, Catastrophe Messenger. She is exceptionally talented in the use of advanced Originium techniques and high-energy Arts.
Currently undergoing treatment at Rhodes Island, Eyjafjalla provides support in Catastrophe research, environmental observation/assessment, assistance in traversing dangerous terrain, among others.
Clinical Analysis
Imaging tests for this Operator showed blurry outlines of internal organs with visible dark spots. Unusually high concentrations of Originium particles were present in her circulatory system, indicating infection and confirming her as Infected at this stage.
[Cell-Originium Assimilation] 8%
Eyjafjalla showed conspicuous symptoms of infection, with corresponding deafness.
[Blood Originium-Crystal Density] 0.5u/L
The level of Eyjafjalla's internal crystals are comparatively high.
Archive File 1
When Eyjafjalla showed up at Rhodes Island for the first time, the personnel leading her to Human Resources noticed some odd behaviors right off the bat: She couldn't make out what people were saying and would sometimes run right into things. People assumed she was some Operator's visiting little sister, or an intern sent by the pharmaceutical department.
A few days later, they were shocked to receive a notice from the executives, approving the Infected Eyjafjalla for missions and the research of Arts and Catastrophes as an official Rhodes Island Operator.
It turns out the little girl they overlooked was a legend among the most renowned academies in Leithanien, fueling speculation about her level of education.
The optimists believed having a young person in the Arts Department would bring some much-needed energy to their somber daily grind. They debated in low but excited voices over who would mentor her internship.
The pessimists lamented that as an Infected, no one could predict where Eyjafjalla might end up in the future.
Archive File 2
According to forms filled out by Eyjafjalla, she was born to a prominent academic family in Leithanien. Her parents worked at Wilhelm University, her father a graduate professor for the School of Originium, her mother an environmental and ecological research specialist. The couple died in a volcanic eruption during a survey.
Eyjafjalla's parents had begun a project to study natural Catastrophes on Terra, and the volcano was a key site. Among the files Eyjafjalla took with her to Rhodes Island, she treasured the report on that volcano most of all. She didn't want the study to end with the passing of her parents, so she decided to continue it in their stead.
Volcanic research must be done on-site before eruption and required long-term close-range observation. Particles with Originium components tended to be common in volcanic areas, and cooling lava constantly turned over new Originium veins, making the region a breeding ground for Oripathy. This is believed to be the reason for Eyjafjalla's infection.
Archive File 3
Eyjafjalla's physical symptoms are very obvious. Oripathy has impaired her hearing considerably, sometimes robbing her of the sense entirely. Fortunately, the impairment has slowed given treatment at Rhodes Island.
Eyjafjalla typically uses a hearing aid, or asks her conversant to repeat loudly themselves in order to communicate.
In addition, certain facial expressions and body language have also proven effective. For example:
Shaking one's head: Unsuccessful dialogue.
Shaking one's head with a surprised expression: Very likely some words have been misunderstood and should be clarified immediately.
Nodding: Successful dialogue.
Noding with a positive expression: Idea successfully communicated, proceed with dialogue. Still, one must be mindful of the context, since the present dialogue might be built on the pretext of a previously unnoticed misunderstanding.
Repeating a word or sentence multiple times: Eyjafjalla is confirming what's been communicated to her, respond positively and mind one's volume.
Glassy-eyed or negative expression: Misunderstanding has possibly occurred. Review previous dialogue to avoid greater misunderstanding.
Archive File 4
[CLASSFIED]
I've perused Eyjafjalla's files and a draft of her thesis.
'The Impact of Underground Originium Veins on Volcanic Cycles' and 'Investigative Report on the Correlation Between Originium and Natural Catastrophes,'plus a few other analyses are... very well done and reasoned.
Also, very dangerous.
I hope everyone realizes she is asking dangerous questions in dangerous areas--and not just academic ones.
You do know ants, right? Then you should know ants love carrion.
Even though the carrion is still rotting, the ants will still rip it to tiny chunks and carry them back to their nest to feed the whole community.
Ants must grow stronger to survive in the world.
Do you get it? If the carrion is Originium, we are feeding our community with it for everyone to grow stronger. And the purpose of that is to defend ourselves... and maybe oppose potential changes in the future.
Yes, according Eyjafjalla's thesis, Originium is a natural Catastrophe.
But we cannot stop, and will not stop.
Let the child continue her research, for now.
Before she can be certain of her own future.
—Excerpt from a closed-door conference, spoken by■■
Promotion Record
Eyjafjalla's pets
serve a similar role as Operator Mousse's 'kitties.' Eyjafjalla's dark-woolen companions appear identical to normal animals in physiology and behavior.
Eyjafjalla calls them 'little black sheep', claiming they were a gift from her mother when she was still alive.
Unlike the naughty 'kitties', the little black sheep are submissive and sluggish, their idea of fun is to nap in Eyjafjalla's room or some place spacious at Rhodes Island.
They helped Eyjafjalla with many things, like move books and deliver goods. They even make good fluffy pillows for her to lay her head on.
[Classified Log]
This is not really confidential information, but something I believe is noteworthy.
Although Eyjafjalla dubbed them 'little', they're still big pets.
Given their size, it is odd that they're hardly spotted at Rhodes Island.
On retrospect, it is suspicious that they only showed up to graze or when Eyjafjalla needed them.
Another usual phenomenon is when they give off high heat when angry or excited, possibly burning your hand when touched.
The truth behind all this is worth investigating.
Stats
- HP236th of 4551,743
- ATK178th of 455645
- DEF359th of 455122
- RES25th of 45220
- Block1
- DP cost278th of 44621
- Redeploy70s
- Attack interval238th of 4551.6s
At Elite 2, level 90, 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: 732ATK: 292DEF: 46RES: 10Block: 1DP: 19Redeploy: 70Interval: 1.6
- Elite 0 Lv. 50HP: 1046ATK: 406DEF: 79RES: 10Block: 1DP: 19Redeploy: 70Interval: 1.6
- Elite 1 Lv. 80HP: 1359ATK: 535DEF: 109RES: 15Block: 1DP: 21Redeploy: 70Interval: 1.6
- Elite 2 Lv. 90HP: 1743ATK: 645DEF: 122RES: 20Block: 1DP: 21Redeploy: 70Interval: 1.6
Base values before trust, potentials and modules. Full trust adds ATK +90.
Trait
- Deals Arts damage
Skills
3
Duetto
Manual trigger · Auto recovery · Unlocks at Elite 0LevelASPD +60 Starting from the second use of the skill, ATK +60%
- SP cost
- 35
- Initial SP
- 25
- Duration
- 25s

Ignition
Auto trigger · Auto recovery · Unlocks at Elite 1LevelDeals 370% of ATK Arts damage in the next attack; Deals half damage to enemies around the target and their RES -25% for 6 seconds Can store 3 charge(s)
- SP cost
- 5
- Initial SP
- 0
- Charges
- 3

Volcano
Manual trigger · Auto recovery · Unlocks at Elite 2LevelATK +130%; Range increases; Attack Interval reduces significantly; Attack becomes randomly shooting lava that can hit at most 6 enemies within range
- SP cost
- 80
- Initial SP
- 55
- Duration
- 15s
Talents
2Pyrobreath
- Elite 1
- All [Caster] Operators' ATK +7% when Eyjafjalla is deployed
- Elite 1 · Potential 6
- All [Caster] Operators' ATK +9% (+2%) when Eyjafjalla is deployed
- Elite 2
- All [Caster] Operators' ATK +14% when Eyjafjalla is deployed
- Elite 2 · Potential 6
- All [Caster] Operators' ATK +16% (+2%) when Eyjafjalla is deployed
Wild Fire
- Elite 2
- Immediately obtains 7 to 15 SP randomly after deployment
- Elite 2 · Potential 3
- Immediately obtains 10 (+3) to 19 (+4) SP randomly after deployment
Potentials
- Potential 2
- DP Cost -1
- Potential 3
- Improves Second Talent
- Potential 4
- ATK +27
- Potential 5
- DP Cost -1
- Potential 6
- Improves First Talent
Modules
2
'Missed Sounds' (CCR-X)
Unlocks at Elite 2 Lv. 60StageStatsTraitTalent- Stage 1Stats: HP +130, ATK +40Trait: Ignore 10 of target's RES
- Stage 2Stats: HP +160, ATK +55Trait: Ignore 10 of target's RESTalent: All [Caster] Operators' ATK +18% when brought
- Stage 3Stats: HP +180, ATK +65Trait: Ignore 10 of target's RESTalent: All [Caster] Operators' ATK +22% when brought
To unlock
- Deal a total of 100,000 damage with Eyjafjalla (excluding Support Units)
- Clear Heart of Surging Flame OF-5 with a 3-star rating; You must deploy your own Eyjafjalla, and can only include 3 other Operators as members
Module record
My Dear Girl:
By the time you can make sense of these Catastrophe data, you will be a capable and independent researcher. I am not worried at all, because I am confident that with your effort and talent, it is only a matter of time. You are my greatest pride.
So more than work-related things, I have something else I would write here for you.
I know you must complain that your father and I always have so little time to be with you. Please believe me when I say this is also our greatest regret. For us, every time we look upon your peaceful, sleeping face, leaving home becomes a difficult prospect. We never know if this goodbye might be forever, and we can’t know how to say goodbye to you under such circumstances.
Know that this field we have given everything to is important.
Humans are so small in the face of the vastness of the land, but we choose not to be small. It is the search for knowledge that gives meaning to our tiny lives.
Knowledge leads humanity to surpass the limitations of what we see, pierce through soil and rock, glimpse the true face of this land, and thus tells us who we are. So even at the mouth of a volcano, beholding the abyss before me, I am thinking that we may be able to go directly to the secrets hidden in the depths of the earth.
This is dangerous work. I am writing these words now, to a certain extent, in order to ease my fear. I always have reasons to press on.
Because this is an ideal I share with your father, and I am fortunate enough to have had a family with him, and your arrival was a gift to the both of us.
Seeing you choose to embark on the same journey as we have, we are over the moons.
Of course, we do not see you as simply our successor, and you have no obligation to inherit our career, but we also believe that you will accomplish things far beyond what we have.
As a researcher, I see many qualities worth emulating in my daughter. She is meticulous, focused, tenacious, and brave. How happy I am to see this in you! I sincerely hope you continue down the path of scientific research and see your efforts bear fruit.
Your father and I have left behind many achievements in our research, but the most precious treasure we leave to this great land is you.
We want to expand the boundaries of human knowledge with you.
That is the goal we are working toward, and you can surely stand on our shoulders to see a clearer, more beautiful world., This letter is found in a thick pile of scientific research documents.

Pet Contest First Prize (CCR-Y)
Unlocks at Elite 2 Lv. 60StageStatsTraitTalent- Stage 1Stats: HP +180, ATK +25Trait: Gain 1 SP when normal attacks hit an elite or leader enemy.
- Stage 2Stats: HP +210, ATK +40Trait: Gain 1 SP when normal attacks hit an elite or leader enemy.Talent: Immediately obtains 7 to 15 SP randomly after deployment; if there are Elite or Leader enemies within range, gains the maximum amount of SP possible
- Stage 3Stats: HP +230, ATK +50Trait: Gain 1 SP when normal attacks hit an elite or leader enemy.Talent: Immediately obtains 7 to 15 SP and 6 to 15 ASPD randomly after deployment; if there are Elite or Leader enemies within range, gains the maximum amount of SP and ASPD possible
To unlock
- During battle, have your own Eyjafjalla use Volcano a total of 6 times
- Clear So Long, Adele: Home Away From Home SL-4 with a 3-star rating; You must deploy your own Eyjafjalla, and have her defeat at least 2 'Big Fellas'
Module record
Adele is a little nervous.
Today is a special day, she had signed up for the school's parent-and-child activity, 'Pet Relay'. Last night, the Little Black Sheep listened to the plan she had drafted together with her parents, three times. Her parents had taken the day off, they're always so busy, so she has to do well this time! A first place would be even better!
After introducing herself and the Little Black Sheep to the judge, Adele nods to her parents to begin. They are dressed as they always are, not a crease to be found on their clothes, their glasses seated firmly on their noses, but Adele knows that Mutti had worn her shoes on the wrong foot and Vati's buttons were all done wrong as they were about to leave home. Were they nervous too?
As the whistle is blown, Adele stands at the designated location of the first section, guiding the Little Black Sheep through the jumping hoop, round the corner, and onto the balance board. Oh, it slipped! No worries, just a little mistake. What's really important is the end... the end... what was the trick to be performed at the end of the section? She couldn't remember! Adele stops in a panic, and the Little Black Sheep starts running amok, seeing that its conductor had stopped moving, knocking over her mother who was standing at the beginning of the second section, then her father who came to help her. Oh no, the race is ruined! What to do? Adele is at a loss.
'Haha!' Somebody in the stands cannot hold back a laugh. Vati finally picks himself up. Seeing a helpless Adele and Little Black Sheep running amok on the course, he decides to try again. He turns his necktie, knocked loose by the Little Black Sheep, into an impromptu conducting baton, guiding it back to the course while looking nothing like the academic who spends most of his time in the library and lab. Mutti tries and fails to find her fallen glasses, but laughs as though she found an extremely rare mineral sample when she sees Vati hard at work and the Little Black Sheep back on track through her blurry vision. She stands up, lifts up the edges of her dress, and squints as she tries to make it to the finish line without stumbling over anything.
'Adele!' She opens her arms and calls to her daughter, who was on the verge of tears. 'Come here!'
Adele hesitates for a moment. She looks at Mutti and Vati, who look disheveled yet happy, and is no longer nervous. She runs towards her mother, the wind rushing by her ears, and it is as though she has never ran faster, nor her feet ever lighter, in her entire life.
The picky Little Black Sheep is finally happy and obediently performs the last trick at her father's instructions, even contributing an impromptu forward somersault. The onlookers cheer and applaud, as Adele continues to run towards the finish line.
This is a special day. Whether she wins first prize or not doesn't seem to matter so much anymore. She runs into the arms of her parents with a big smile on her face, enjoying a rare family holiday.
'Baa!' Finding itself excluded from the embrace, the Little Black Sheep begins to bleat loudly in protest.
Base skills
2
Volcanologist
Factory · Elite 0When this Operator is assigned to a Factory, Originium formula related productivity +35%

Catastrophe Messenger β
Office · Elite 2When this Operator is assigned to the HR Office, HR contacting speed +45%
Outfits
4
Elite 1
Default Outfit
Art by Anmi

Elite 2
Default Outfit
Art by Anmi

Summer Flowers FA018
Coral Coast/V
Art by Anmi
Store

Fluffy Little Witch
Sanrio characters/II
Art by Anmi
Store
Voice lines
38Show all 38 lines
- Appointed as Assistant
- Professor, I've finished all my Catastrophe studies notes. Do you have any more I could read?
- Talk 1
- Huh? What? Why do I call you 'Professor'? Well, you're an expert on Catastrophe studies, so you're like a professor, right? Aren't we all supposed to address our superiors with respect?
- Talk 2
- Pardon me? Please say that again? Oh, you're wondering why I'm hard of hearing? Well, I got infected with Oripathy back when I was doing research near a volcano...
- Talk 3
- Besides completing the tasks you give me, I have to go to Dr. Kal'tsit regularly for checkups. The doctor said my symptoms are pretty serious...
- Talk after Promotion 1
- I have to work hard to finish the research my parents began! I want to prove that their work was meaningful, and that it could maybe even change the world!
- Talk after Promotion 2
- My parents... they've passed on. A pyroclastic flow hit them when they were conducting studies near a volcano... I have to pick up where they left off and finish their research, no matter what!
- Talk after Trust Increase 1
- My playmates? I'm pretty friendly with Mousse and some others, so I don't feel lonely at all! If possible, I'd love to start a book club with them too. Could we hold our club meetings in your office, Professor?
- Talk after Trust Increase 2
- Dr. Kal'tsit told me... I'm losing not only my sense of hearing, but my sense of sight too. …Well, what else might this disease do to me?
- Talk after Trust Increase 3
- How could I tell you were behind me? Because I could feel your warmth! My eyesight and hearing aren't as sharp as they once were, but my other senses are still the same. Can't bring me down this easily, you know!
- Idle
- Professor! Oh... You're asleep...?
- Onboard
- I'm Eyjafjalla. My career before joining Rhodes Island was in the field of volcanology. I'm a bit hard of hearing due to my Oripathy. I just hope I won't be a burden to you, Professor.
- Watching Battle Record
- Please teach me all you can, Professor.
- Promotion 1
- Promotion? Really? I'm so happy to have your approval, Professor!
- Promotion 2
- My mother gave me these little lambs. They're cute, aren't they? Huh? They're scorching hot? Be careful! You have to put on oven mittens before touching them!
- Added to Squad
- Understood, Professor.
- Appointed as Squad Leader
- Don't forget to prepare emergency supplies as well as weapons!
- Depart
- We can take care of ourselves, Professor. You just focus on giving orders.
- Begin Operation
- Stay safe, everyone.
- Selecting Operator 1
- Professor?
- Selecting Operator 2
- Please give your orders, Professor.
- Deployment 1
- I'll be careful.
- Deployment 2
- All the best!
- In Battle 1
- Temperature is stable!
- In Battle 2
- This may be a little hot...
- In Battle 3
- Watch out for fires.
- In Battle 4
- How's that?
- 4-star Result
- I'm so glad you're safe, Professor...
- 3-star Result
- Why must our world be enveloped in strife?
- Sub 3-star Result
- Is everyone okay? Anything I can do?
- Operation Failure
- Ow... It's... It's okay... I'm fine...
- Assigned to Facility
- This room makes me feel safe.
- Tap
- Eek! You startled me, Professor!
- Trust Tap
- Thank you, Professor, for helping me become a stronger person.
- Title
- Arknights.
- New Year's blessing
- Happy New Year, Professor! Everyone's happily prepping their presents and decorations, and so many operators have come to talk to me. I can't hear them clearly all the time, but when I see the looks on their faces, I'm sure they must all be very warm words. Professor, I wish you that warmth, too.
- Greeting
- Good morning, Professor!
- Birthday
- Professor, do you know there's a cake that's both named after and inspired by volcanoes? It's called 'lava cake.' I asked Gummy and Mousse, and they taught me how to make it. When you cut it open, the chocolate inside comes spilling out. Here's your cake, Professor, Happy birthday.
- Anniversary Celebration
- Thank you for everything you've done for me over the last year, Professor. I'm delighted to be here with you. There's still so much I don't know about volcanoes and Catastrophes. Before I get to the point where I can't continue my surveys and research, I'm devoting all my energy into this. That way, I can live with no regrets.
Upgrade costs
Open in the plannerPromotion
- Elite 1
Caster Chip ×5
Oriron ×7
Sugar ×5
LMD ×30,000 - Elite 2
Caster Dualchip ×4
Polymerization Preparation ×4
Optimized Device ×5
LMD ×180,000
Skill levels
- Lv. 2
Skill Summary - 1 ×5 - Lv. 3
Skill Summary - 1 ×5
Oriron Shard ×5
Sugar Substitute ×4 - Lv. 4
Skill Summary - 2 ×8
Polyketon ×4 - Lv. 5
Skill Summary - 2 ×8
Device ×3
Polyester ×3 - Lv. 6
Skill Summary - 2 ×8
Loxic Kohl ×7 - Lv. 7
Skill Summary - 3 ×8
Manganese Ore ×3
RMA70-12 ×4
Mastery: Duetto
- M1
Skill Summary - 3 ×6
Grindstone Pentahydrate ×4
Loxic Kohl ×7 - M2
Skill Summary - 3 ×12
Sugar Lump ×4
RMA70-24 ×8 - M3
Skill Summary - 3 ×15
Polymerization Preparation ×6
Optimized Device ×4
Mastery: Ignition
- M1
Skill Summary - 3 ×6
RMA70-24 ×4
Manganese Ore ×5 - M2
Skill Summary - 3 ×12
Polyester Lump ×4
Orirock Concentration ×10 - M3
Skill Summary - 3 ×15
Polymerization Preparation ×6
Manganese Trihydrate ×6
Mastery: Volcano
- M1
Skill Summary - 3 ×6
Orirock Concentration ×4
Grindstone ×7 - M2
Skill Summary - 3 ×12
Oriron Block ×4
Sugar Lump ×7 - M3
Skill Summary - 3 ×15
D32 Steel ×6
Keton Colloid ×5
Module: 'Missed Sounds' (CCR-X)
- Stage 1
Module Data Block ×4
Polymerization Preparation ×2
LMD ×80,000 - Stage 2
Module Data Block ×4
Data Supplement Stick ×60
Crystalline Electronic Unit ×3
LMD ×100,000 - Stage 3
Module Data Block ×4
Data Supplement Instrument ×20
Bipolar Nanoflake ×4
LMD ×120,000
Module: Pet Contest First Prize (CCR-Y)
- Stage 1
Module Data Block ×4
Crystalline Electronic Unit ×2
LMD ×80,000 - Stage 2
Module Data Block ×4
Data Supplement Stick ×60
Rephasic Enantiomer ×3
LMD ×100,000 - Stage 3
Module Data Block ×4
Data Supplement Instrument ×20
Polymerization Preparation ×4
LMD ×120,000
How to get Eyjafjalla
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