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Si, Cryo Supporter operator | Arknights: Endfield

Hongshan Academy of Sciences

Si

Build guide · Arknights: Endfield

6-star
CryoSupporterGreat SwordSub DPS

English voice: 兽兽王 (Shoushou Wang)

The best Si build in Arknights: Endfield (Version 1.6) is Jade Vessel with Type 50 Yinglung. Updated

Key facts

Si is a 6-star Cryo Supporter operator from Hongshan Academy of Sciences, wielding a Great Sword. Sub DPS / Support build, skill scalings, promotion and…

Rarity
6★
Attribute
Cryo
Class
Supporter
Weapon type
Great Sword
Faction
Hongshan Academy of Sciences
Released
Version 1.6 · 2026-10-15
Best weapon
Jade Vessel
Core set
Type 50 Yinglung
Tier list
T0

Arknights: Endfield 6★ Cryo Supporter Sub DPS

Si build summary

Updated November 6, 2026

Jade Vessel tops the weapon ranking for Si at P1, ahead of Long Heritage and Khravengger. That order is prydwen.gg's, measured in play and condensed to a sentence each; every row of it sits under Weapons below.

Run Type 50 Yinglung on Si, with Eternal Xiranite behind it.

Skill priority is COMBO SKILL > ULTIMATE = BATTLE SKILL > BASIC ATTACK. The Ultimate costs 80 Ultimate Energy, which is what an Ultimate Gain Efficiency target has to clear.

The strongest team is Si, Arcane, Tangtang and Perlica, built around Si: Cryo · Combo Skill burst.

Role
Sub DPS / Support
Best weapon
Jade Vessel
Gear set
Type 50 Yinglung
Skill priority
COMBO SKILL > ULTIMATE = BATTLE SKILL > BASIC ATTACK
Best team
Si, Arcane, Tangtang, Perlica
Ultimate Energy cost
80 Ultimate Energy
Key promotion material
8× Cosmagaric
Last updated
November 6, 2026
Full Si build: weapons, gear and teams

Skills

Si Artistic Urge, Basic Attack icon | Arknights: Endfield
Basic

Artistic Urge

BASIC ATTACK: An attack with up to 5 sequences that deals Cryo DMG. As the controlled operator, Final Strike also deals 18 Stagger. DIVE ATTACK: Basic attack performed in mid-air becomes a dive attack that deals Cryo DMG to nearby enemies. FINISHER: Basic attack performed near a Staggered enemy becomes a finisher that deals massive Cryo DMG and recovers some SP.

Skill level

BATK SEQ 1 Multiplier
45%
BATK SEQ 2 Multiplier
72%
BATK SEQ 3 Multiplier
66%
BATK SEQ 4 Multiplier
54%
BATK SEQ 5 Multiplier
144%
Dive ATK Multiplier
180%
Finisher ATK Multiplier
900%
All 12 levels
Scaling123456789101112
BATK SEQ 1 Multiplier20%22%24%26%28%30%32%34%36%39%42%45%
BATK SEQ 2 Multiplier32%35%38%42%45%48%51%54%58%62%66%72%
BATK SEQ 3 Multiplier29%32%35%38%41%44%47%50%53%56%61%66%
BATK SEQ 4 Multiplier24%26%29%31%34%36%38%41%43%46%50%54%
BATK SEQ 5 Multiplier64%70%77%83%90%96%102%109%115%123%133%144%
Dive ATK Multiplier80%88%96%104%112%120%128%136%144%154%166%180%
Finisher ATK Multiplier400%440%480%520%560%600%640%680%720%770%830%900%
Si Brushwork Realm, Battle Skill icon | Arknights: Endfield
Skill

Brushwork Realm

  • The recorded damage is shown in increments of 10000 on the HUD. A 5 displayed on the green ring for example means that 50000 to 59999 DMG is recorded. Not all forms of damage will be recorded, for example damage dealt by Combat Facilities, the Flamethrowers found in Etchspace Salvage, Exploding Barrels, or the self-inflicted damage by Æthillus is not recorded. But on the other side, the damage dealt to enemies defeated by stage mechanics, such as the exploding Mudflow in Tidal Grief or the linked Woodcraft Wanderer in Woodcrafts That Link, will be recorded. Damage done by Industrial Explosives can also be recorded. The Inksoul can be understood as an extension of the hitbox of an enemy, it's not possible for a hit to register on both the Inksoul and the host. Combat Facilities do not target the Inksoul and can not damage it.
  • 100 SP

Si deals Cryo DMG and applies Artful Intent, Immobilization, and Cryo Infliction (or Heat Infliction if a Heat element operator is in Team Position 01) on the target. After a target with Artful Intent takes DMG, part of the DMG taken is recorded. When the duration of Artful Intent ends, it bursts and deals Fixed DMG equal to the DMG recorded. After casting the skill, Si's battle skill is temporarily changed to Initial Stroke. Initial Stroke: Costs 15 SP. Si pulls an Inksoul from a target with Artful Intent. All DMG dealt and effects applied to the Inksoul will also be dealt to its host (the said target). The Inksoul lasts as long as the remaining duration of Artful Intent. After casting the skill, Si's battle skill is temporarily changed to Final Stroke. Final Stroke: Costs no SP. Makes the Inksoul disappear early. When disappearing, the Inksoul will move to its host and trigger a burst like the ending burst of Artful Intent. When dealing DMG or applying effects to both the Inksoul and the host, only 1 instance of the DMG or effect is dealt/applied. If the host is defeated during the Inksoul's duration, it will link to another enemy in combat and apply Artful Intent to it. This does not reset the duration of Artful Intent. If a target with Artful Intent is defeated without having its Inksoul drawn out of it, the defeated target will drop an Inksoul at its location.

Skill level

SP Cost
15
DMG Multiplier
100%
Immobilization Duration (s)
1
Artful Intent Duration (s)
20
DMG Record Ratio
13%
Stagger
5
Artful Intent Burst Stagger
5
All 24 levels
Scaling123456789101112131415161718192021222324
SP Cost100100100100100100100100100100100100151515151515151515151515
DMG Multiplier44%49%53%58%62%67%71%76%80%86%92%100%
Immobilization Duration (s)111111111111
Artful Intent Duration (s)202020202020202020202020
DMG Record Ratio8%8%8%9%9%9%10%10%10%11%12%13%
Stagger555555555555
Artful Intent Burst Stagger555555555555
Si Fully Envisioned, Combo Skill icon | Arknights: Endfield
Combo

Fully Envisioned

  • 16s cooldown

Si summons an Ink Lung that deals Cryo DMG. This DMG is based on the highest stacks of Arts Infliction consumed or absorbed from a single target. Trigger: When an enemy's Cryo Infliction or Heat Infliction is consumed or absorbed.

Skill level

Cooldown
15
DMG Multiplier
750%
Multiplier Increase per Stack Consumed or Absorbed
100%
Stagger
10
Ultimate Energy Gain
10
All 12 levels
Scaling123456789101112
Cooldown161616161616161616161615
DMG Multiplier333%367%400%433%467%500%533%567%600%642%692%750%
Multiplier Increase per Stack Consumed or Absorbed44%49%53%58%62%67%71%76%80%86%92%100%
Stagger101010101010101010101010
Ultimate Energy Gain101010101010101010101010
Si No One Spoils the Fun, Ultimate icon | Arknights: Endfield
Ultimate

No One Spoils the Fun

  • 80 Ultimate Energy

Si summons a Giant Ink Lung from her painting that deals Cryo DMG and grants temporary Cryo Amp and Heat Amp to the entire team.

Skill level

Ultimate Energy Cost
80
DMG Multiplier
500%
Stagger
20
Amp
36%
Amp Duration (s)
12
All 12 levels
Scaling123456789101112
Ultimate Energy Cost808080808080808080808080
DMG Multiplier222%244%267%289%311%333%355%378%400%428%461%500%
Stagger202020202020202020202020
Amp20%21%22%24%25%26%28%29%30%32%34%36%
Amp Duration (s)121212121212121212121212

Talents

  1. Si Keen Mind, talent icon | Arknights: EndfieldElite 1

    Keen Mind

    1. Elite 1

      Operator Intellect +10.

    2. Elite 2

      Operator Intellect +15.

    3. Elite 3

      Operator Intellect +15.

    4. Elite 4

      Operator Intellect +20.

  2. Si Proxy's Patronage, talent icon | Arknights: EndfieldElite 1

    Proxy's Patronage

    1. Elite 1

      Ultimate skill No One Spoils the Fun improved: After casting, Team Position 01 operator's combo skill cooldown length -10s.

    2. Elite 2

      Ultimate skill No One Spoils the Fun improved: After casting, Team Position 01 operator's combo skill cooldown length -20s.

  3. Si Unsoiled Brush, talent icon | Arknights: EndfieldElite 2

    Unsoiled Brush

    1. Elite 2

      When the Inksoul disappears, allied operators gain 15% Haste for 5s.

    2. Elite 3

      When the Inksoul disappears, allied operators gain 30% Haste for 5s.

  4. Si Outfitting, talent icon | Arknights: EndfieldElite 1

    Outfitting

    1. Elite 1

      Activate this to let the operator equip blue quality gear

    2. Elite 2

      Activate this to let the operator equip purple quality gear

    3. Elite 3

      Activate this to let the operator equip gold quality gear

Stat talent

Intellect
60

Keen Mind at full unlock, summed across every tier. Elite rank gates the tiers as it gates the talents above.

Potentials

  1. Si P1 Spring and Autumn as Ink, Potential | Arknights: EndfieldP1

    Spring and Autumn as Ink

    Battle skill Brushwork Realm improved: Duration of Immobilization applied +50%; Artful Intent DMG Record Ratio +7% and burst radius +40%.

  2. Si P2 Three Marks Deep in Wood, Potential | Arknights: EndfieldP2

    Three Marks Deep in Wood

    Combo skill Fully Envisioned improved: When casting, Si gains ATK +[8% + 3%×(Highest stacks of Arts Infliction consumed or absorbed from a single target)] for 10s. This effect cannot stack.

  3. Si P3 Study of Muscles and Bones, Potential | Arknights: EndfieldP3

    Study of Muscles and Bones

    Ultimate No One Spoils the Fun improved: DMG Dealt is increased to 1.2 times the original; Amp effect is increased to 1.2 times the original.

  4. Si P4 Perfectly Composed in Spirit, Potential | Arknights: EndfieldP4

    Perfectly Composed in Spirit

    Ultimate No One Spoils the Fun improved: Ultimate Energy cost -15%.

  5. Si P5 Brush Dab in Eye's White, Potential | Arknights: EndfieldP5

    Brush Dab in Eye's White

    Combo skill Fully Envisioned improved: Length of combo skill cooldown -2s and DMG Dealt is increased to 1.15 times the original. When triggered, treat the combo skill as having consumed or absorbed 1 additional stack of infliction.

Full bill

Level 90 and every skill at 12

814,900

T-Creds 15 material lines

Elite 4 and level 90

126,100

T-Creds 7 materials · 4 steps

All 4 skills at 12

688,800

T-Creds 4× the single-skill bill

Elite promotion

  1. Elite 1
    Pink Bolete, promotion material | Arknights: EndfieldPink Bolete ×3
    Protodisk, promotion material | Arknights: EndfieldProtodisk ×8

    1,600T-Creds

  2. Elite 2
    Red Bolete, promotion material | Arknights: EndfieldRed Bolete ×5
    Protodisk, promotion material | Arknights: EndfieldProtodisk ×25

    6,500T-Creds

  3. Elite 3
    Protoset, promotion material | Arknights: EndfieldProtoset ×24
    Ruby Bolete, promotion material | Arknights: EndfieldRuby Bolete ×5

    18,000T-Creds

  4. Elite 4
    Cosmagaric, promotion material | Arknights: EndfieldCosmagaric ×8
    Warp Plasma-Coated Slide, promotion material | Arknights: EndfieldWarp Plasma-Coated Slide ×20
    Protoset, promotion material | Arknights: EndfieldProtoset ×36

    100,000T-Creds

Total to level 90

126,100 T-Creds

Cosmagaric, promotion material | Arknights: EndfieldCosmagaric ×8
Warp Plasma-Coated Slide, promotion material | Arknights: EndfieldWarp Plasma-Coated Slide ×20
Pink Bolete, promotion material | Arknights: EndfieldPink Bolete ×3
Protoset, promotion material | Arknights: EndfieldProtoset ×60
Red Bolete, promotion material | Arknights: EndfieldRed Bolete ×5
Ruby Bolete, promotion material | Arknights: EndfieldRuby Bolete ×5
Protodisk, promotion material | Arknights: EndfieldProtodisk ×33

Skill materials

  1. → 2
    Kalkodendra, promotion material | Arknights: EndfieldKalkodendra ×1
    Protoprism, promotion material | Arknights: EndfieldProtoprism ×6

    1,000T-Creds

  2. → 3
    Kalkodendra, promotion material | Arknights: EndfieldKalkodendra ×2
    Protoprism, promotion material | Arknights: EndfieldProtoprism ×12

    2,700T-Creds

  3. → 4
    Chrysodendra, promotion material | Arknights: EndfieldChrysodendra ×1
    Protoprism, promotion material | Arknights: EndfieldProtoprism ×16

    3,200T-Creds

  4. → 5
    Chrysodendra, promotion material | Arknights: EndfieldChrysodendra ×1
    Protoprism, promotion material | Arknights: EndfieldProtoprism ×21

    4,200T-Creds

  5. → 6
    Chrysodendra, promotion material | Arknights: EndfieldChrysodendra ×2
    Protoprism, promotion material | Arknights: EndfieldProtoprism ×27

    5,400T-Creds

  6. → 7
    Protohedron, promotion material | Arknights: EndfieldProtohedron ×6
    Vitrodendra, promotion material | Arknights: EndfieldVitrodendra ×1

    8,200T-Creds

  7. → 8
    Protohedron, promotion material | Arknights: EndfieldProtohedron ×8
    Vitrodendra, promotion material | Arknights: EndfieldVitrodendra ×1

    10,500T-Creds

  8. → 9
    Protohedron, promotion material | Arknights: EndfieldProtohedron ×15
    Vitrodendra, promotion material | Arknights: EndfieldVitrodendra ×2

    18,000T-Creds

  9. → 10
    False Aggela, promotion material | Arknights: EndfieldFalse Aggela ×3
    Mark of Perseverance, promotion material | Arknights: EndfieldMark of Perseverance ×1
    Metadiastima Photoemission Tube, promotion material | Arknights: EndfieldMetadiastima Photoemission Tube ×6
    Protohedron, promotion material | Arknights: EndfieldProtohedron ×15

    24,000T-Creds

  10. → 11
    False Aggela, promotion material | Arknights: EndfieldFalse Aggela ×6
    Mark of Perseverance, promotion material | Arknights: EndfieldMark of Perseverance ×2
    Metadiastima Photoemission Tube, promotion material | Arknights: EndfieldMetadiastima Photoemission Tube ×16
    Protohedron, promotion material | Arknights: EndfieldProtohedron ×24

    30,000T-Creds

  11. → 12
    False Aggela, promotion material | Arknights: EndfieldFalse Aggela ×12
    Mark of Perseverance, promotion material | Arknights: EndfieldMark of Perseverance ×3
    Metadiastima Photoemission Tube, promotion material | Arknights: EndfieldMetadiastima Photoemission Tube ×36
    Protohedron, promotion material | Arknights: EndfieldProtohedron ×50

    65,000T-Creds

One skill at 12

172,200 T-Creds

False Aggela, promotion material | Arknights: EndfieldFalse Aggela ×21
Mark of Perseverance, promotion material | Arknights: EndfieldMark of Perseverance ×6
Metadiastima Photoemission Tube, promotion material | Arknights: EndfieldMetadiastima Photoemission Tube ×58
Chrysodendra, promotion material | Arknights: EndfieldChrysodendra ×4
Kalkodendra, promotion material | Arknights: EndfieldKalkodendra ×3
Protohedron, promotion material | Arknights: EndfieldProtohedron ×118
Vitrodendra, promotion material | Arknights: EndfieldVitrodendra ×4
Protoprism, promotion material | Arknights: EndfieldProtoprism ×82

All 4 skills at 12

688,800 T-Creds

False Aggela, promotion material | Arknights: EndfieldFalse Aggela ×84
Mark of Perseverance, promotion material | Arknights: EndfieldMark of Perseverance ×24
Metadiastima Photoemission Tube, promotion material | Arknights: EndfieldMetadiastima Photoemission Tube ×232
Chrysodendra, promotion material | Arknights: EndfieldChrysodendra ×16
Kalkodendra, promotion material | Arknights: EndfieldKalkodendra ×12
Protohedron, promotion material | Arknights: EndfieldProtohedron ×472
Vitrodendra, promotion material | Arknights: EndfieldVitrodendra ×16
Protoprism, promotion material | Arknights: EndfieldProtoprism ×328

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