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Si Best Build Guide - Weapons, Gear & Teams

Complete progression guide from level 1 to 80+ with BiS weapons, gear sets, and team compositions

Updated: 10/24/2026|BiS + F2P Options
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Si Best Build - Quick Summary

Best Weapon
Jade Vessel
R1 Cryo Greatsword - BiS
Best Gear Set
Type 50 Yinglung
Set - Standard build. Xaihi already holds Eternal Xirani...
Best Team
Si + Xaihi + Arcane + Last Rite
Cryo Support composition

Skill Priority

Battle Skill→Ultimate→Combo Skill→Normal Attack

Battle Skill provides Cryo application. Ultimate gives team-wide buffs. Combo Skill triggers easily on Final Strike.

Best Team Compositions

Recommended Cryo Team
Si
Cryo Support
Xaihi
Support
Arcane
Support
Last Rite
Support
6★SupportCryoGreatsword

Limited Cryo Supporter on a Greatsword who gives the whole team Cryo and Heat Amp with her Ultimate, turns stored damage into Fixed DMG with Artful Intent, and summons an Ink Lung whenever a teammate consumes Cryo or Heat Infliction.

Build Focus

Intellect, Strength, Combo Skill DMG, and Ultimate Gain Efficiency

Skill Priority

Ultimate > Combo Skill > Battle Skill > Normal Attack

Playstyle

Open with Brushwork Realm to mark the target with Artful Intent and Immobilize it, let a teammate consume the Cryo or Heat Infliction to fire Fully Envisioned, and cast No One Spoils the Fun for team Cryo and Heat Amp, which also cuts the Team Position 1 operator's combo cooldown. Recast the battle skill as Initial Stroke to pull an Inksoul from a boss that moves away, and end it with Final Stroke for an early Fixed DMG burst.

Quick Reference Summary

Endgame

Move to Type 50 Yinglung with the 1.6 Soft Armor, two Beacons and Eternal Xiranite Channeling Gloves.

Max Level

Keep Type 50 Yinglung, and swap to Eternal Xiranite only when no teammate already wears it.

early_game1-20

Weapons

BiSJade Vessel6★Greatsword
Base ATK
500
Substat
Intellect
Effect
Source: Arsenal Exchange / Seal of Jade Issue banner
Why: If you pulled it with her, equip it from day one: Intellect, Cryo DMG and ATK +44.8% at max rank.
F2PDarhoff 73★Greatsword
Base ATK
283
Substat
Main Attribute
Effect
Source: Operator Recruitment
Why: Her default weapon. Its Main Attribute line rolls Intellect for her, which is all she needs while leveling.

Gear Sets

Best in SlotBasic Gear Pack(Any 3 pieces)0Gray
Why this set?

Save upgrade materials for the Type 50 Yinglung set she wants later.

Source:

Stat Priorities

Main Stats
IntellectATK%
Sub Stats
IntellectStrengthATK%

mid_game20-40

Weapons

BiSJade Vessel6★Greatsword
Base ATK
500
Substat
Intellect
Effect
Source: Arsenal Exchange / Seal of Jade Issue banner
Why: Her Immobilization turns on its DMG Taken line for the whole team, and her Ultimate turns on its combo line.
F2PLong Heritage6★Greatsword
Base ATK
485
Substat
Intellect
Effect
Source: Version 1.6 Protocol Pass
Why: The same Intellect and Cryo DMG lines as her signature, and its Cryo DMG trigger fires off her own battle skill.

Gear Sets

Best in SlotMiner α Gear Pack(3pc)0Green
Why this set?

A cheap transition set before specialized support gear.

Source:

Stat Priorities

Main Stats
IntellectUltimate Gain Efficiency
Sub Stats
IntellectATK%Cryo DMG

late_game40-60

Weapons

BiSJade Vessel6★Greatsword
Base ATK
500
Substat
Intellect
Effect
Source: Arsenal Exchange / Seal of Jade Issue banner
Why: Still her best weapon. Spend materials on gear instead of chasing a replacement.

Gear Sets

Best in SlotTide Surge(3pc)Tier 2Purple
Why this set?

Her battle skill applies Cryo Infliction and her teammates stack more, so the 2-stack Arts DMG bonus is easy to keep up for the Ink Lung.

Source:

Stat Priorities

Main Stats
IntellectUltimate Gain EfficiencyCryo DMG
Sub Stats
IntellectATK%Strength

endgame60-80

Weapons

BiSJade Vessel6★Greatsword
Base ATK
500
Substat
Intellect
Effect
Source: Arsenal Exchange / Seal of Jade Issue banner
Why: ATK +44.8%, DMG Taken +21% on the target she Immobilizes for the whole team, and next combo DMG +70% after her Ultimate.
F2PLong Heritage6★Greatsword
Base ATK
485
Substat
Intellect
Effect
Source: Version 1.6 Protocol Pass
Why: Main attribute +19.6% and Cryo DMG +16.8% after her battle skill applies Infliction.

Gear Sets

Best in SlotType 50 Yinglung(3pc)Tier 3GoldLv.70
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).
Why this set?

Every team battle skill stacks Yinglung's Edge for up to +60% on her Ink Lung, her biggest hit. The 1.6 Soft Armor and Beacons are Intellect and Strength pieces with Combo Skill DMG lines, and the Si damage calculator puts this about 29% ahead of Eternal Xiranite on the Ink Lung.

Recommended: Type 50 Yinglung Soft Armor (Armor) + Eternal Xiranite Channeling Gloves (Gloves) + 2x Type 50 Yinglung Beacon (Kit)
Source:
AlternativeEternal Xiranite(3pc)
Wearer's HP +1000
After the wearer applies Amp, Protected, Susceptibility, or Weakened, other teammates also gain DMG Dealt +16% for 15s. This effect cannot stack.

Her Ultimate's team Cryo and Heat Amp triggers team DMG +16%. Use it only when no teammate already holds Eternal Xiranite (Xaihi, Ardelia, Arcane and Gilberta usually do), since the same-name buff does not stack.

Recommended: Eternal Xiranite MOD Armor (Armor) + Eternal Xiranite Channeling Gloves (Gloves) + 2x Eternal Xiranite Rangefinder (Kit)

Stat Priorities

Main Stats
IntellectStrengthCombo Skill DMG
Sub Stats
IntellectCombo Skill DMGUltimate Gain Efficiency

max80-90

Weapons

BiSJade Vessel6★Greatsword
Base ATK
500
Substat
Intellect
Effect
Source: Arsenal Exchange / Seal of Jade Issue banner
Why: Signature and best in slot for both her support and damage roles.
PremiumKhravengger6★Greatsword
Substat
Strength
Effect
Why: The game's third tier 1 pick for her. Its Cryo lines fire off her battle skill and combo, but its Strength line is her secondary attribute.

Gear Sets

Best in SlotType 50 Yinglung(3pc)Tier 3GoldLv.70
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).
Why this set?

Still her best set: Combo Skill DMG on every slot plus up to three Yinglung's Edge stacks on each Ink Lung. A second Beacon beats a Type 50 Yinglung Knife T1 in the last Kit slot for Ink Lung damage.

Recommended: Type 50 Yinglung Soft Armor (Armor) + Eternal Xiranite Channeling Gloves (Gloves) + 2x Type 50 Yinglung Beacon (Kit)
Source:
AlternativeAIC Fieldwork(3pc)

When a teammate holds Eternal Xiranite and the team wants more Amp windows, AIC Fieldwork Ultimate Gain +10% plus an Ultimate Gain line on all four pieces brings her Ultimate and the slot 1 combo cooldown cut around sooner.

Recommended: AIC Fieldwork Plate (Armor) + AIC Fieldwork Hands (Gloves) + AIC Fieldwork Ember (Kit) + Eternal Xiranite Power Core (Kit)

Stat Priorities

Main Stats
IntellectStrengthCombo Skill DMG
Sub Stats
IntellectCombo Skill DMGUltimate Gain Efficiency

Final Build Optimization

Quick Reference

Si Build FAQ

Which Si skill should I level first?
Prioritize No One Spoils the Fun for the Amp, then Fully Envisioned and Brushwork Realm, followed by her basic attack.
Which Si gear set should I use?
Type 50 Yinglung: the Soft Armor, two Beacons and the Eternal Xiranite Channeling Gloves, all Intellect and Strength pieces with Combo Skill DMG from Version 1.6. Use Eternal Xiranite only when no teammate already holds it, since its team buff does not stack.

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