Si Build Guide: Best Weapons, Gear & Teams | Arknights: Endfield

Si arrives in Arknights: Endfield on October 15, 2026, with the Sanctuary of Ink update. This 6-star Cryo Supporter brings a distinctive mix of team buffs and damage recording, while her combo cooldown reduction gives the first-slot operator another reason to take center stage. Getting her build right also means choosing teammates who can activate her combo consistently. This guide covers Si’s recommended weapons, gear, skill priorities, and teams to help you put her painting-inspired kit to work.

Overview

Si is a six-star Cryo Supporter who combines team amplification, battlefield control, and personal damage. Her distinctive Inksoul mechanic lets teammates transfer damage and effects to an enemy through a separate target, helping them maintain pressure when its host moves out of reach. Artful Intent adds delayed area damage by recording part of the damage dealt during its duration. She fits Cryo and Heat teams, particularly alongside damage dealers who consume or absorb Infliction and regularly use combo skills. With elemental amplification and cooldown reduction for the first-slot operator’s combo, Si helps coordinate the team’s burst while contributing follow-up damage of her own.

 

Skills & Leveling Priority

Skill Priority

Combo Skill > Ultimate > Battle Skill > Basic Attack

Prioritize Combo Skill and Ultimate for the recommended 12 / 12 / 9 / 9 build. Battle Skill remains worth further investment for Artful Intent, especially when Si supports a heavily invested carry. Basic Attack can wait while resources are limited.

 

Best Weapon

Signature Weapon

Alternative

 

Best Gear Set

DPS

The three-piece set grants ATK and builds Yinglung’s Edge whenever any teammate casts a Battle Skill. Those stacks strengthen Si’s next Combo Skill, matching a team that spends skills building Infliction before consuming it. Soft Armor, the INT and STR hand piece, and Beacon also concentrate stats into Intellect and Combo Skill DMG. LYNX Slab is the off-set piece for its Main Attribute bonus.

Support

Channeling Gloves and two Rangefinders activate Eternal Xiranite while retaining Combo Skill DMG on the individual pieces. Si’s Ultimate applies Amp and activates the set’s damage buff for other teammates. Redeemer Armor supplies Intellect and Ultimate Gain Efficiency. This is a useful support setup when another carry takes priority.

 

Best Team Comps

This lineup makes Si the main damage focus. Use Arcane’s WILL configuration to copy existing Cryo Infliction, then use a Nature Battle Skill against Cryo to trigger Corrosion and enable Si’s Combo Skill. Tangtang supplies Cryo Infliction and builds Whirlpools; consuming them with her Battle Skill creates extra Waterspouts for Arts Susceptibility. Xaihi adds healing and amplification, with her Combo Skill becoming available after the controlled operator uses both Auxiliary Crystal charges through Final Strikes.

Laevatain takes the first slot so Si applies Heat Infliction. Arcane’s WILL configuration duplicates existing Heat stacks, helping Laevatain build Melting Flame through her absorption talent. That absorption also triggers Si’s Combo Skill. Ardelia supplies healing and forcibly applies Corrosion with her Combo Skill, enabling Laevatain’s Combo Skill without first needing Combustion. Let Laevatain use that opening before Ardelia consumes Corrosion with Dolly Rush to apply Arts Susceptibility, boosting both Laevatain’s Heat damage and Si’s Cryo damage.

Yvonne’s bomb consumes Cryo or Nature Infliction, forcibly applies Solidification, and generates Ultimate Energy based on the stacks consumed. Consume Cryo stacks to enable Si’s Combo Skill; consuming Nature alone does not satisfy Si’s trigger. Arcane’s WILL configuration helps build the Cryo stack count, while Xaihi supports the controlled operator through Final Strikes and supplies Cryo and Nature Amp with her Ultimate. Si contributes her own burst alongside Yvonne’s enhanced attacks.

Tangtang can replace Xaihi when extra application and Arts Susceptibility are more valuable than healing.

 

Last Rite’s Combo Skill consumes all Cryo Infliction once a target has at least three stacks, generating Ultimate Energy and enabling Si’s Combo Skill. Her Battle Skill also contributes Cryo through a pursuit attack after the controlled operator’s next Final Strike. Arcane’s WILL configuration duplicates the existing Cryo stack and applies Cryo Susceptibility, while Xaihi supplies healing and team amplification. Use Final Strikes to progress both Last Rite’s Battle Skill effect and Xaihi’s crystal charges.

Tangtang can replace Xaihi for additional Cryo application and Arts Susceptibility, trading away Xaihi’s healing.

 

Conclusion

Build Si around the stacks her teammates can provide and the damage window she is meant to support. Yinglung rewards her own Combo Skill investment, while Eternal Xiranite offers a support route. With the first slot, energy needs, and Infliction triggers arranged, she can lead a Cryo lineup or contribute alongside Laevatain, Last Rite, and Yvonne.

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