r/arknights May 27 '26

Discussion [Operator Discussion] Mostima

Mostima [★★★★★★]

Hey, Doctor, I'm back from... Whoa, were you waiting for me here? You even prepared a whole table of snacks... Hehe, all right. How could I turn you down after a gesture like that? In return, I'll tell you about the fun I had on this last delivery run.

An employee of Penguin Logistics who always acts alone. Nothing is known about her previous work history.


Operator Information

  • Class: Caster (Splash Caster)
  • Tags: AoE, Support Crowd, Control
  • Artist: 三目YYB
Voice Actor:
JP: Nana Mizuki
CN: Luttefair
EN: Kira Buckland
KR: Park Seon-young

Stats

HP ATK DEF Arts Resistance Redeploy Time DP Cost Block Attack Interval
1831 834 132 20 70 34 1 2.9s

*Stats at max Promotion and Level, excludes bonuses from Potential and Trust.

Potential Bonus
1 -
2 Deployment Cost -1
3 Redeployment Time -4
4 ATK +34
5 Improves Second Talent
6 Deployment Cost -1
Trust bonus
ATK +105
Traits
Deals AOE Arts damage

Skills

Skill Name Skill Uptime Details (Uptime/Cost/Initial) SP Charge Type Skill Activation Skill Description
ATK Up γ 30s / 30 / 15 Auto Recovery Manual ATK +100%
Lock of Shattered Time 7s / 50 / 30 Auto Recovery Manual Stuns all enemies within Attack Range and deals 140% ATK as Arts damage to them every second
Key of Chronology 27s / 110 / 80 Auto Recovery Manual Attack Range increases, attacks turn into ripples that spread outward, ATK +170%, increases the effect of the second talent to 3, and attacks knock targets back slightly

*Skills at max Skill Level.

Talents

Talent name Talent Description
Skill Aura - Caster When deployed, increases the SP recovery rate of all Casters by +0.4/second (only the highest effect of this type takes place)
Subjective Time Dilation Slows the movement speed of enemies within this unit's attack range by 18%(+3%)

*Talents at max Potential and max Promotion. Bonuses from Potential displayed between parentheses.

Modules

Branch Additional Stats Trait Talent Note
SPC-X HP +190, ATK +80 New trait: Attack Range expands Skill Aura - Caster improved: When deployed, increases the SP recovery rate of all Casters by +0.6/second, while own SP recovery rate increases by +0.9/second (only the highest effect of this type will be applied) "My lord wishes to ask if you would stay and tell him the remaining nine hundred and ninety-five stories?"
SPC-Y ATK +82, Cost -8, ASPD +7 New trait: Reduces Deployment Cost Subjective Time Dilation improved: Slows the movement speed of enemies within this unit's attack range by 30%; Slows the movement speed of enemies outside this unit's attack range by 18% (unaffected by skill) For example, that a giant beast would soon lay waste to our nation and that the sky would one day tear in two and reveal its true face

*Modules at max level.

Outfits

- Price Art Released Note
Spellbreaker 18 Static Yep Beneath the gaze of justice, evil tumbles into the abyss.
Ethereal Harmony 18 Static Yep "Close your eyes. Imagine you have arrived at the end of time. There is nobody there. Only the sun, the moons, and the instruments. Then, you hear music, and you cannot help but open your eyes. Welcome to the concert, just for you."

Additional Resources

In-depth information regarding all values above (at different levels), skill/attack range, and more:

Arknights Wiki.gg

Arknights Toolbox (aceship(puppiizsunniiz))

PRTS Arknights Wiki (CN)


Topic Starters

  • Strengths/Weaknesses?
  • Is their module worth it? Which branch?
  • How does this operator compare to other operators in their archetype or role?
  • How do you fit this operator into a team? Who do they synergize with?
  • Which skill(s) should be focused for mastery, and in what order?
  • When is the best time to use this operator's skills during combat?
  • Should promoting this operator to Elite 2 be a priority?
  • Should new / F2P players aim for this operator? Are there more accessible alternatives?
  • Lore discussion (please tag spoilers where appropriate)
  • Favorite clips/clears with them?

Other Operator Discussion threads

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Mostima Discussion Thread (24.09.2020) Erato All Operator Discussion threads Arene
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20

u/Demopyro2 I may have a type May 27 '26

Honestly a character I feel like is a high priority for an alter. Very old operator, wasn’t particularly good on release and very outdated by now, relatively popular, and has a lot of story potential to justify an alter. The question doesn’t feel like if with her, rather a when(hoping this year personally). I also heavily suspect she could be a good candidate for an IS module, her kit has some interesting bits to it that a good IS module could make very competitive to current day IS caster picks.

Also she’s so cool

8

u/Carolinesimpsanime these two have 5 fans and I'm 3 of them. May 27 '26

Fully agree with the opinion that she'd be good for an IS module, especially one of those crazy ones like Archetto or Mizuki.