Arknights: Endfield Si Build Guide — Top Weapons, Gear, and Team Lineups

Si makes her debut in Arknights: Endfield on October 15, 2026 alongside the Sanctuary of Ink update. Team buffs and damage recording come together in unusual fashion for this 6-star Cryo Supporter, while her combo cooldown reduction means the first-slot operator has yet another reason to remain front and center. For her build to succeed, you will also need teammates capable of triggering her combo on a regular basis. Below, you’ll find Si’s recommended weapons and gear, a skill priority list, and team setups that make the most of her painting-inspired kit.

Overview

Rarity: 6-star | Class: Supporter | Weapon: Greatsword | Element: Cryo

Team amplification, battlefield control, and damage of her own are all part of Si’s role as a six-star Cryo Supporter. Through her signature Inksoul mechanic, damage and effects can be passed by teammates to an enemy via a separate target, which lets them keep the pressure on even after its host has moved beyond reach. Artful Intent turns a portion of the damage dealt during its duration into delayed area damage. Damage dealers who regularly use combo skills and either consume or absorb Infliction make ideal partners, especially in Cryo and Heat teams. Si also brings elemental amplification and cooldown reduction to the first-slot operator’s combo, helping the team’s burst line up while adding follow-up damage herself.

Skills and Leveling: What to Prioritize

Basic Attack — Artistic Urge

BASIC ATTACK:

Perform up to 5 consecutive attack sequences, dealing Cryo DMG. When controlled by the player, the Final Strike also inflicts 18 Stagger.

DIVE ATTACK:

When Basic Attack is performed in mid-air, it becomes a dive attack that deals Cryo DMG to nearby enemies.

FINISHER:

When Basic Attack is performed near a Staggered enemy, it becomes a finisher that deals massive Cryo DMG and restores a portion of SP.

Battle Skill — Brushwork Realm

Si deals Cryo DMG to the target while applying Artful Intent, Immobilization, and Cryo Infliction (or Heat Infliction if a Heat element operator is in Team Position 01). Whenever a target affected by Artful Intent takes DMG, a portion of the DMG received is recorded. When Artful Intent expires, it triggers a burst that deals Fixed DMG equal to the total recorded DMG. After this skill is cast, Si's battle skill temporarily changes to Initial Stroke.

Initial Stroke: Costs 15 SP. Si extracts an Inksoul from a target affected by Artful Intent. All DMG dealt to the Inksoul and all effects applied to it are also dealt to its host (the original target). The Inksoul remains active for the duration of Artful Intent. After casting this skill, Si's battle skill temporarily changes to Final Stroke.

Final Stroke: Costs no SP. Causes the Inksoul to disappear early. Upon disappearing, the Inksoul returns to its host and triggers a burst similar to the one that occurs when Artful Intent expires.

When DMG is dealt or effects are applied to both the Inksoul and its host, only one instance of the DMG or effect is counted. If the host is defeated while the Inksoul is active, the Inksoul links to another enemy in combat and applies Artful Intent to that target without resetting its duration. If a target affected by Artful Intent is defeated before its Inksoul is extracted, an Inksoul will drop at the target's location.

Combo Skill — Fully Envisioned

Si summons an Ink Lung to deal Cryo DMG. The damage dealt is determined by the highest number of 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.

Ultimate — No One Spoils the Fun

Si brings forth a Giant Ink Lung from her painting, dealing Cryo DMG and granting the entire team temporary Cryo Amp and Heat Amp.

Skill Priority

Combo Skill > Ultimate > Battle Skill > Basic Attack

Skill	Target level	Main purpose
Fully Envisioned	12	Personal burst damage
No One Spoils the Fun	12	Cryo and Heat amplification
Brushwork Realm	9	Artful Intent and Infliction setup
Artistic Urge	9	Basic attacks and finishers

For the recommended 12 / 12 / 9 / 9 build, prioritize Combo Skill and Ultimate. Battle Skill is also worth investing in further to strengthen Artful Intent, particularly when Si is supporting a heavily invested carry. Basic Attack can be left for later while resources are limited.

Best Weapon

Signature Weapon

Jade Vessel

When the wielder applies Immobilization to an enemy, the target takes 12.0% more DMG for 30s. When the wielder applies Immobilization to an enemy or casts an Ultimate, the next Combo Skill used within 20s gains 40% DMG Dealt.

The two effects activate independently and do not stack with themselves.

Jade Vessel is Si's top weapon choice. Its Intellect, Cryo DMG, and ATK bonuses all contribute to her damage output, while the Immobilization from her Battle Skill activates its enemy DMG Taken debuff. Applying Immobilization or casting an Ultimate also boosts the next Combo Skill used within the effect's duration. This weapon complements both aspects of Si's role by increasing the damage enemies take and enhancing her own burst potential. To make the most of its effects, time a Combo Skill after each qualifying activation instead of expecting the buff to apply to every cast.

Alternative

Long Heritage

Rarity: 6✦ | Type: Great Sword | Base ATK: 485 | Intellect: +156 | Cryo DMG Bonus: +43.30%

| Main Attribute: +11.20%

When the wielder's Battle Skill applies Cryo Infliction or Heat Infliction, the wielder gains 9.6% Cryo DMG Dealt for 20s.

When the wielder grants Arts Amp to another operator on the team, all team members gain 6.4% Arts DMG Dealt for 20s.

The two effects activate independently and do not stack with themselves.

Long Heritage is Si's primary alternative available through the Protocol Pass. Its Intellect and Cryo DMG bonuses complement her kit, while applying Cryo Infliction or Heat Infliction with her Battle Skill activates its personal Cryo damage boost. Granting Arts Amp to another teammate triggers the team-wide Arts DMG bonus, which Si can activate with her Ultimate. Since the Infliction condition supports both Cryo and Heat, this weapon fits more easily into either team type. Be sure to consider Weapon Potential when comparing it against other options.

Khravengger

When the wielder's Battle Skill applies Cryo Infliction, the wielder gains 16% Cryo DMG Dealt for 15s. When the wielder deals Combo Skill DMG to an enemy affected by Cryo Infliction, the wielder gains 32% Cryo DMG Dealt for 15s. The two effects activate independently and do not stack with themselves.

Khravengger is a situational alternative if you already own it. Its ATK and All Skill DMG bonuses benefit Si, but activating its additional effects requires her Battle Skill to apply Cryo Infliction and her Combo Skill to hit an enemy that still has Cryo Infliction. If Si consumes all Cryo stacks to trigger her effects, the target may lose the status required to activate the second bonus. Whenever possible, reapply Cryo before her attack lands. If a Heat operator occupies the first team position, Si's Battle Skill applies Heat instead, reducing this weapon's overall synergy.

Best Gear Set

DPS

Type 50 Yinglung Soft Armor

Type 50 Yinglung Gloves

Type 50 Yinglung Beacon

LYNX Slab

The three-piece set provides ATK and generates Yinglung’s Edge whenever any teammate casts a Battle Skill. These stacks boost Si’s next Combo Skill, making the set a good fit for teams that build up Infliction with Battle Skills before consuming it. Soft Armor, the INT and STR hand piece, and Beacon further emphasize Intellect and Combo Skill DMG. LYNX Slab fills the off-set slot with its Main Attribute bonus.

Support

Redeemer Armor

Eternal Xiranite Channeling Gloves

Eternal Xiranite Rangefinder

Channeling Gloves paired with two Rangefinders activate Eternal Xiranite while preserving Combo Skill DMG bonuses on the individual pieces. Si’s Ultimate grants Amp, triggering the set’s damage buff for other teammates. Redeemer Armor adds Intellect and Ultimate Gain Efficiency, making this setup a solid support-oriented option when boosting another carry is the main priority.

Best Team Comps

Si+Tangtang+Xaihi+Arcane

This team centers on Si as the primary damage dealer. Arcane’s WILL configuration copies existing Cryo Infliction, while using a Nature Battle Skill against a Cryo-inflicted enemy triggers Corrosion and sets up Si’s Combo Skill. Tangtang applies Cryo Infliction and builds Whirlpools, which she consumes with her Battle Skill to generate additional Waterspouts and apply Arts Susceptibility. Xaihi provides healing and amplification, with her Combo Skill becoming available after the controlled operator uses both Auxiliary Crystal charges through Final Strikes.

Laevatain+Si+Ardelia+Arcane

Laevatain takes the first team slot to make Si apply Heat Infliction. Arcane’s WILL configuration duplicates existing Heat stacks, helping Laevatain accumulate Melting Flame through her absorption talent. This absorption also triggers Si’s Combo Skill. Ardelia provides healing and forcibly applies Corrosion with her Combo Skill, allowing Laevatain to activate her Combo Skill without needing Combustion first. Let Laevatain take advantage of this opening before Ardelia consumes Corrosion with Dolly Rush to apply Arts Susceptibility, increasing both Laevatain’s Heat damage and Si’s Cryo damage.

Yvonne+Si+Arcane+Xaihi

Yvonne’s bomb consumes Cryo or Nature Infliction, forcibly applies Solidification, and generates Ultimate Energy according to the number of stacks consumed. Consume Cryo stacks to activate Si’s Combo Skill, as consuming Nature Infliction alone does not meet her trigger requirement. Arcane’s WILL configuration helps increase the number of Cryo stacks, while Xaihi supports the controlled operator through Final Strikes and grants Cryo and Nature Amp with her Ultimate. Si adds her own burst damage to complement Yvonne’s enhanced attacks.

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

Last Rite+Si+Arcane+Xaihi

Last Rite’s Combo Skill consumes all Cryo Infliction once a target reaches at least three stacks, generating Ultimate Energy while also activating Si’s Combo Skill. Her Battle Skill provides additional Cryo through a pursuit attack following the controlled operator’s next Final Strike. Arcane’s WILL configuration duplicates the existing Cryo stack and applies Cryo Susceptibility, while Xaihi offers healing and team-wide amplification. Use Final Strikes to advance both Last Rite’s Battle Skill effect and Xaihi’s Auxiliary Crystal charges.

Tangtang can replace Xaihi to provide more Cryo application and Arts Susceptibility, at the cost of Xaihi’s healing.

Conclusion

Si’s build only clicks when her combo triggers, buffs, and first-slot synergy all feed the same damage plan. Pick your main damage dealer first, then round out the lineup around a rotation you can rely on.

Aiming to bring Si home, or chasing down her signature weapon? Head over to WISHGM to save on your next purchase. Wishing you early Si pulls—good luck!