What attribute is Si?

Si is a 6-star Cryo operator of the Supporter class, from Hongshan Academy of Sciences, wielding a Great Sword, released in version 1.6.

What stat does Si scale on?

Si's skills multiply ATK. That is read from the scaling rows on the Battle Skill and Ultimate, not from the skill description, so it reflects what the game actually multiplies rather than what the text mentions.

What is the best weapon for Si?

Jade Vessel is the closest fit on the data: it is a 6-star Great Sword with 500 base ATK at level 90, and its skills act on ATK. Industry 0.1 is the best 4-star alternative.

How much does it cost to max Si's skills?

Taking one combat skill from level 1 to 12 costs 172,200 T-Creds and 21× False Aggela among other materials. The Materials tab lists every item per level.

Si, Cryo Supporter operator | Arknights: Endfield

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Hongshan Academy of Sciences

Si

Build guide · Arknights: Endfield

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 November 6, 2026

Key facts

The best Si build in Arknights: Endfield (Version 1.6) is Jade Vessel with Type 50 Yinglung. 6-star Cryo Supporter operator.

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

Where these rankings come fromThe weapon order, gear sets and Potential verdicts on this tab are prydwen.gg’s, measured in play and condensed to a sentence each. Relative damage figures are ratios against the bottom of each ranking, not absolute numbers, and each one holds only for the Potential and team its row states. Everything else (base stats, skill text, material totals) is read from the game’s own data.

Weapons

3 ranked

BISJade Vessel

Ranked first at P1

Jade Vessel is Si's Signature and her best weapon: Intellect, Cryo DMG and unsaturated ATK, a team-wide DMG Taken debuff from her Battle Skill's Immobilization, and a Combo Skill DMG buff that fits Artful Intent's 20s.

500

Base ATK · lv 90

51 at lv 1

Ranked first at P1

#2Long Heritage

Ranked #2 at P5

Long Heritage, the Battle Pass weapon, is the pick without her Signature, trading the ATK line for Main Attribute, though its team-wide DMG Dealt bonus only triggers off her Ultimate.

485

Base ATK · lv 90

49 at lv 1

Ranked #2 at P5

Long Heritage, the Battle Pass weapon, is the pick without her Signature, trading the ATK line for Main Attribute, though its team-wide DMG Dealt bonus only triggers off her Ultimate.

#3Khravengger

Ranked #3 at P1

Khravengger has no Intellect line but its ATK helps a lot, and it can beat Long Heritage, though its 15s Cryo Infliction window forces awkward rotations, so use it only if Long Heritage can't reach high Potential.

505

Base ATK · lv 90

51 at lv 1

Ranked #3 at P1

Gear

2 sets

CoreType 50 Yinglung

Type 50 Yinglung is her ideal set, since she is starved of ATK and does nearly all her damage with Combo Skills, and she usually holds 2+ Yinglung Edge stacks, which beats Eternal Xiranite even as a Support.

3PC3-piece set effect: Wearer's ATK +15%. When any operator in the team casts a battle skill, the wearer gains 1 stack of Yinglung's Edge that gives DMG +20% to the wearer's next combo skill. Yinglung's Edge can stack 3 time(s).

Also works

Eternal XiraniteEternal Xiranite is the fallback when her Signature is missing and her own damage drops, and some pieces still carry Combo Skill DMG so she keeps contributing.

Skill priority

Generalist

#1
COMBO SKILL
Max first
#2
ULTIMATE = BATTLE SKILL
Then
#3
BASIC ATTACK
Next

Potentials review

Rated P1 first

PotentialsPick a node for its verdict and in-game text.

Spring and Autumn as Ink

P1's boost to Artful Intent's damage record is a large team-wide gain that nothing else saturates, and the wider burst radius reaches extra enemies in some Umbral and Echoes of War stages.

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

Brush Dab in Eye's White

P5 is her strongest: a shorter Combo Skill cooldown, x1.15 damage, and +1 Infliction stack counted, so the Combo Skill acts as if it absorbed 5 stacks and lifts P2's ATK buff to 23%.

In gameCombo 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.

Each verdict is prydwen.gg’s, condensed to a sentence; the figures are relative damage at that Potential. Every Potential Si has, in full, is on the Kit tab.

Teams

5 teams

Si team

Cryo · Combo Skill burstLeads

Si, this operatorMain DPS: Combo Skill burst
ArcaneEnabler: duplicates Inflictions and triggers Corrosion
TangtangCryo infliction: Cryo infliction to stack
PerlicaElectric infliction: Electric infliction to stack

Rossi team

Arts · Ultimate burstStands in for Perlica

RossiMain DPS: Lift and crit
PerlicaElectric infliction: Electric infliction to stackor Si
TangtangCryo infliction: Cryo infliction to stack
GilbertaSupporter: Nature infliction and grouping

Last Rite team

Cryo · SolidificationStands in for Xaihi

Last RiteMain DPS: Solidification trigger
XaihiSupporter: Amp and HP treatmentor Si
TangtangCryo infliction: Cryo infliction to stack
PerlicaElectric infliction: Electric infliction to stack

Laevatain team

Heat · CombustionStands in for Wulfgard

LaevatainMain DPS: Combustion trigger
WulfgardHeat infliction: Heat infliction to stackor Si
AkekuriVanguard: SP
GilbertaSupporter: Nature infliction and grouping

Yvonne team

Cryo · Solidification into ShatterStands in for Xaihi

YvonneMain DPS: Solidification trigger
XaihiSupporter: Amp and HP treatmentor Si
GilbertaSupporter: Nature infliction and grouping
TangtangCryo infliction: Cryo infliction to stack

All teams, with every replacement

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
Alternatives: Long Heritage, Khravengger
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

Si skills, talents and materials

8 links

Teammates

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Si pull statsReal pull data from Si

Si FAQ

What attribute is Si?: Si is a 6-star Cryo operator of the Supporter class, from Hongshan Academy of Sciences, wielding a Great Sword, released in version 1.6.
What stat does Si scale on?: Si's skills multiply ATK. That is read from the scaling rows on the Battle Skill and Ultimate, not from the skill description, so it reflects what the game actually multiplies rather than what the text mentions.
What is the best weapon for Si?: Jade Vessel is the closest fit on the data: it is a 6-star Great Sword with 500 base ATK at level 90, and its skills act on ATK. Industry 0.1 is the best 4-star alternative.
Which gear set should Si use?: Type 50 Yinglung. Its 3-piece effect is: 3-piece set effect: Wearer's ATK +15%. When any operator in the team casts a battle skill, the wearer gains 1 stack of Yinglung's Edge that gives DMG +20% to the wearer's next combo skill. Yinglung's Edge can stack 3 time(s). The 3-piece effect is the only set bonus a gear set has, and it needs three matching pieces; an operator equips four in all (Armor, Gloves and two Kits), so the fourth is free for an off-set piece.
How much does it cost to max Si's skills?: Taking one combat skill from level 1 to 12 costs 172,200 T-Creds and 21× False Aggela among other materials. The Materials tab lists every item per level.
What does Si P1 do?: 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%.

Si

Key facts

Weapons

Gear

Skill priority

Potentials review

Teams

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Si FAQ

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