Arknights Wiki
★★★★★★
Rosa (Роса)
Besieger
Rosa, a member of the Ursus Student Self-Governing Group, is ready to welcome a new life.
Give her some time.
Position Ranged
Tags DPS, Crowd-Control
Trait Attacks the heaviest enemy first
Availability Headhunting; Recruitment

Stats[]

Range
Base
     
  
 
  
Elite 1
   
  
 
  
   
Elite 2
   
  
 
  
   
Attributes Trust bonus
HP 800 1067 1351 1755
ATK 492 684 856 1032 +110
DEF 60 80 100 122
RES 0 0 0 0
Rdpl. time 70s 70s 70s 70s
DP cost 22 22 24 24
Blk. cnt. 1 1 1 1
Atk. itvl. 2.4s 2.4s 2.4s 2.4s
Potential
DP cost -1
Redeployment time -4 seconds
ATK +34
Improves Ideal Student
DP cost -1
Total Cost
Rosa's Token
5
OR
Royal Sniper Token
20
Promotion
Elite 1
  • Maximum attributes increased.
  • DP cost +2.
  • New skill: Split Shot.
  • New talent: Bone Piercer.
  • Range extended.
Level 50
LMD
30K
Sniper Chip
5
Sugar
8
Polyester
5
Elite 2
  • Maximum attributes increased.
  • New skill: Avalanche Breaker.
  • New talent: Ideal Student.
  • Bone Piercer improved.
  • Operator Modules available.
Elite 1 Level 80
LMD
180K
Sniper Dualchip
4
Bipolar Nanoflake
4
Optimized Device
6

Skills[]

ATK Up γ
Auto Recovery
Manual Trigger
30 sec.
Level Effect Initial SP SP cost Duration
ATK +30% 0 40 30s
ATK +35% 0 40 30s
ATK +40% 0 40 30s
ATK +45% 5 37 30s
ATK +50% 5 37 30s
ATK +55% 5 37 30s
ATK +60% 10 35 30s
ATK +75% 10 34 30s
ATK +90% 10 33 30s
ATK +100% 15 30 30s
Split Shot
Auto Recovery
Manual Trigger
60 sec.
Level Effect Initial SP SP cost Duration
ATK +30%, and attacks hit one additional enemy 39 80 60s
ATK +35%, and attacks hit one additional enemy 40 80 60s
ATK +40%, and attacks hit one additional enemy 41 80 60s
ATK +45%, and attacks hit one additional enemy 42 80 60s
ATK +50%, and attacks hit one additional enemy 43 80 60s
ATK +55%, and attacks hit one additional enemy 44 80 60s
ATK +60%, and attacks hit one additional enemy 45 80 60s
ATK +70%, and attacks hit one additional enemy 45 75 60s
ATK +80%, and attacks hit one additional enemy 45 70 60s
ATK +90%, and attacks hit one additional enemy 45 65 60s
Avalanche Breaker
Auto Recovery
Manual Trigger
6-8 sec.
Level Effect Initial SP SP cost Duration
ATK +10%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 10 40 6s
ATK +10%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 10 39 6s
ATK +10%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 10 38 6s
ATK +10%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 11 37 6s
ATK +10%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 11 36 6s
ATK +10%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 11 35 6s
ATK +10%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 12 34 7s
ATK +15%; Immediately fires harpoons at the 3 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 13 33 7s
ATK +20%; Immediately fires harpoons at the 4 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 14 32 7s
ATK +25%; Immediately fires harpoons at the 4 heaviest enemies within range, Binding them and attacking them once each second during the duration of this skill 15 30 8s

Skill upgrades

Skill Summary - 1
5
Skill Summary - 1
5
Sugar Substitute
5
Diketon
4
Skill Summary - 2
8
Polyester
5
Skill Summary - 2
8
Oriron
4
Sugar
3
Skill Summary - 2
8
Grindstone
5
Skill Summary - 3
8
Incandescent Alloy
4
Manganese Ore
5
ATK Up γ
Skill Summary - 3
6
Polymerized Gel
4
Orirock Cluster
11
Split Shot
Skill Summary - 3
6
Oriron Block
4
Incandescent Alloy
4
Avalanche Strike
Skill Summary - 3
6
Optimized Device
3
Oriron Cluster
4
ATK Up γ
Skill Summary - 3
12
Incandescent Alloy Block
4
RMA70-24
8
Split Shot
Skill Summary - 3
12
Keton Colloid
4
Polymerized Gel
9
Avalanche Breaker
Skill Summary - 3
12
White Horse Kohl
4
Keton Colloid
8
ATK Up γ
Skill Summary - 3
15
Polymerization Preparation
6
Manganese Trihydrate
6
Split Shot
Skill Summary - 3
15
D32 Steel
6
Optimized Device
4
Avalanche Breaker
Skill Summary - 3
15
Bipolar Nanoflake
6
RMA70-24
5

Talent(s)[]

Bone Piercer
Elite 1 When attacking a heavy enemy, ignore 40% of its DEF (enemies with 3 weight or higher count for this effect)
Elite 2 When attacking a heavy enemy, ignore 60% of its DEF (enemies with 3 weight or higher count for this effect)
Ideal Student
Elite 2 When this unit is in the squad, all [Ursus Student Self-Governing Group] Operators gain +8% ATK
Elite 2Potential 5 When this unit is in the squad, all [Ursus Student Self-Governing Group] Operators gain +10% ATK (+2%)

Base skills[]

Student Council President Base
When this Operator is assigned to the Control Center, each Operator from Ursus Student Self-Governing Group increases the Morale of all Operators in the Control Center by +0.05 per hour
Prestige Elite 2
When this Operator is assigned to the HR Office, increases HR contacting speed by +20%, and for every 1 contacts made, increases the likelihood of obtaining Ursus Student Self-Governing Group clues (working time and recruitment slots improves the likelihood)

Modules[]

Original
Rosa's Badge
Operator Rosa has demonstrated a remarkable aptitude for maintaining distance whilst conducting suppressive fire against enemies of heavy caliber.
The Field Operations Department has thus passed the following resolution:
This operator shall be appointed a Sniper Operator during field operations to exercise Besieger responsibilities.
In witness whereof,
This badge is hereby conferred upon the above named.
SIE-X
Siege Equipment Training Device
Stage 1
New trait: When attacking a heavy enemy (weight 3 or greater), ATK increased to 115%
Attributes increased:
ATK +60
DEF +30
Stage 2
Bone Piercer improved: When attacking a heavy enemy, ignore 60% of its DEF and deals an additional 40% ATK as Physical damage (enemies with 3 weight or higher count for this effect)
Attributes increased:
ATK +78
DEF +40
Stage 3
Bone Piercer improved: When attacking a heavy enemy, ignore 60% of its DEF and deals an additional 60% ATK as Physical damage (enemies with 3 weight or higher count for this effect)
Attributes increased:
ATK +90
DEF +45
Description

Chernobog.
Natalya curled up her legs to cover them with the plastic sheet. She already knew how to get a little warmth while sleeping alone, and how to avoid being discovered by other refugees or the Reunion Movement. It wasn't actually time to sleep, but she was too tired. In hopes of getting Lada a little soup with flavor for her fever, Sonya grabbed half a leather belt off another group of refugees. And, of course, they didn't let her go easy. They chased Sonya all the way back to their hiding place. The commotion woke the already weak and drowsy Natalya. She used the huge weapon she had been carrying on her back for the first time.
A few days ago, they dragged it out of a burnt-out ruin, and after inspecting the remaining parts, despair yet again cast its shadow on their hearts–it was practically unusable. Natalya describes it as a former siege weapon, now abandoned. Several eyes looked it over only to fall into silence.
But Natalya still found a few almost-usable cloth straps and fixed the huge device to her shoulder. Anna and Sonya said nothing, they just clutched their own handy weapons tightly and walked on in silence. Natalya followed.
The massive weapon now rested across the bottom of Lada's neck, covered with a layer of found fabric, making it just a little bit softer. It didn't actually fire anything that could cause any real damage in the recent scuffle, but Natalya stood in front of a few already-broken refugees, and snapped off a component of unknown function–the weapon worked strangely, a mixture of thick black smoke and flames gushed out, igniting the debris next to it. The fire drove off the refugees who were pursuing Sonya, meaning they lost their own hiding place.
Several hands tugged at the plastic sheet in the corner. Anna coughed weakly, trying to muffle the sound in her throat. Sonya stared into space with her eyes wide open, not allowing herself to sleep. The flickering flames in the distance reflected on their faces. The feverish Lada suddenly clenched her fists and woke up from her sleep, muttering and grabbing the small pot next to her, preparing to rush out.
Anna skillfully placed her hand over Lada's forehead, and Sonya pressed down the corner of the plastic sheet to prevent the wind from coming in. Through the gap in the sheet, they saw the dark night sky, glittering stars, and Natalya, still cowering alone nearby. Lada murmured and reached out to her, and after grabbing her equally pale hand, she quieted down and slowly fell back asleep.
The next day, Natalya felt an unfamiliar warmth beside her. When she woke up, she saw a small, yellow, dirty star-shaped plush toy hanging off her weapon, swaying back and forth. Lada wrinkled her nose and laughed.

Rhodes Island.
"Please wait a moment, Sonya. I'm not ready yet."
"Ugh, you suck, Natalya."
"Listen, you're a logistics operator, and you're the one who applied for a replacement weapon. How did I end up being the one pushing you through the process?"
"Because I suddenly realized that I've gotten used to it."
"You've never even fired the thing. The last time you tried, the pile of scrap almost exploded on you."
"I know how maximally utilize its functions."
"You told us it was a military siege weapon."
"Well, I like its color."
"Ugh, are you screwing with me? Do you wanna use it or not?"
The white-haired girl laughed. She fiddled with a dirty, tattered, star-shaped plush toy behind her back and remembered the night when she huddled with her companions for warmth.
"I've changed my mind. I don't want to replace it. To me, Sonya, it's more than just a weapon."

Module MissionsUnlock conditions
  1. Deal a total of 80,000 damage with Rosa (excluding Support Units)
  2. Clear Main Theme 7-9 with a 3-star rating; You must deploy your own Rosa, and cannot include any other Sniper Operators as members
  • Complete both of Rosa's SIE-X Module Missions.
  • Raise Rosa to Elite 2 Level 60.
  • Have at least 100% Trust with Rosa.
Materials
Stage 1
Module Data Block
4
Polymerization Preparation
2
LMD
80K
Stage 2
Module Data Block
4
Data Supplement Stick
60
D32 Steel
3
LMD
100K
Stage 3
Module Data Block
4
Data Supplement Instrument
20
Crystalline Electronic Unit
4
LMD
120K

Changelog[]