Arknights: Endfield Si Build Guide: Best Weapons, Gear, and Teams

Si is a new 6-star operator in Arknights: Endfield who specializes in Cryo and Heat damage amplification, making her a valuable choice for teams built around elemental Inflictions and Combo Skills.

Her damage potential depends on how effectively the team applies and consumes elemental Inflictions, so choosing the right weapons, gear, and teammates is essential.

This guide covers Si's recommended build, skill priorities, team compositions, and combat rotation ahead of the October 15, 2026, version update.

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▍Si Overview

Si works best in teams that can consistently apply Cryo or Heat Inflictions and trigger her Combo Skill. Rather than treating her as a standalone damage dealer, build the entire squad around her elemental synergy and burst windows.

▍Si's Skills

Si's kit revolves around elemental Inflictions, damage amplification, and her unique Inksoul mechanic. Understanding how these systems interact is more important than simply maximizing her personal stats.

Basic Attack

Si performs a sequence of up to five attacks that deal Cryo DMG. Her basic attacks contribute to her overall damage, but her main value comes from skill interactions and Combo Skill bursts.

Battle Skill: Brushwork Realm, Initial Stroke, and Final Stroke

Brushwork Realm deals damage, applies an elemental Infliction based on the first operator's team position, and marks the target with Artful Intent. Si can then summon an Inksoul and trigger its explosion through subsequent skill casts.

Combo Skill: Fully Envisioned

This skill activates when an enemy's Cryo or Heat Infliction is consumed or absorbed. Its damage increases with the number of Infliction stacks consumed, making teammates who trigger elemental reactions especially valuable.

Ultimate: No One Spoils the Fun

Si deals area damage, grants Cryo and Heat DMG amplification to the team, and reduces the Combo Skill cooldown of the operator in the first team position. This makes team positioning an important part of her build.

Her two defining mechanics are equally important:

• Artful Intent: Records a portion of the damage dealt to the marked target and releases the recorded damage as area Fixed DMG when the effect expires.
• Inksoul: Creates a stationary target that echoes damage and effects to the linked enemy. This helps the team maintain damage against bosses that move or teleport.

These mechanics make Si useful for both concentrated boss damage and clearing groups of enemies.

▍Best Weapons for Si

Si's weapon choices should complement her Intellect attribute and damage-oriented Combo Skill. Her signature weapon, Jade Vessel, is the recommended starting point, while Long Heritage is a potential alternative for players who do not obtain her signature.

The pre-release build guide identifies these two weapons as Si's leading candidates. However, detailed weapon performance and final rankings should be revisited after Version 1.6 becomes playable.

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▍Best Gear Set and Stats for Si

The recommended starting point for Si is the Type 50 Yinglung gear set. Its Combo Skill-oriented effect is expected to complement her damage profile, although the final gear bonuses and stat rolls need confirmation after launch.

The table above is a build-planning framework, not a confirmed list of optimal individual pieces. Exact slot recommendations should be adjusted to the available gear and final attribute scaling.

Recommended Stat Priorities

Use the following priorities as a starting point rather than a fixed, fully tested stat ranking:

• Intellect and compatible offensive attributes: Start with Si's main attribute and verify which stats improve her actual skill multipliers.
• Damage-oriented bonuses: Favor effects that improve her Combo Skill and other important damage sources.
• Cryo or Heat synergy: Consider team-wide damage amplification and the elemental Inflictions generated by your teammates.
• Cooldown reduction: Treat this as a secondary option unless testing shows that it improves the number of useful Combo Skills within a rotation.

Avoid automatically stacking cooldown reduction or Arts Intensity without checking how those stats interact with Si's final kit. Her primary damage source and her team's ability to consume elemental Inflictions should guide your final gear choices.

Alternative Gear Sets

Eternal Xiranite

A potential team-support alternative, but its value depends on the final set bonuses and whether another operator already uses the same non-stacking effect.

Pulser Labs

A lower-priority option because its Solidification-related requirements may interfere with the team's intended Combo Skill triggers and rotation.

These alternatives are based on pre-release theorycrafting. Reassess them when the complete Version 1.6 gear data becomes available.

▍Best Si Team Compositions

Si is most effective when her teammates can apply Cryo or Heat Inflictions, consume or absorb those Inflictions, and benefit from her elemental amplification. The following compositions cover Cryo-focused damage, Heat-focused teams, and more accessible alternatives.

1. Si Cryo Team

• Si: Provides Cryo/Heat amplification, Combo Skill damage, and Inksoul utility.
• Xaihi: Supplies healing and Cryo application, helping maintain both team survivability and elemental synergy.
• Arcane: Provides Arts Susceptibility and additional support for the team's damage window.
• Last Rite: Acts as a Cryo damage dealer who can consume Cryo stacks and help trigger Si's Combo Skill.

This composition is a strong starting point for players who want to build around Si's Cryo mechanics. The team can repeatedly apply Cryo, trigger elemental interactions, and capitalize on Si's Combo Skill.

Positioning tip:

Put Si in the first team slot if you want her Ultimate to shorten her own Combo Skill cooldown. This setup emphasizes Si's damage and can enable consecutive Inksoul attacks.

2. Si Heat Team

• Laevatain: Main damage dealer who benefits from Heat amplification and elemental Infliction interactions.
• Si: Adds Heat application, team-wide elemental amplification, and additional burst damage.
• Wulfgard: Provides further Heat application to support the team's elemental rotation.
• Ardelia: Supplies healing and helps the team maintain its offensive rhythm.

In this composition, Laevatain should occupy the first team position. Si's Battle Skill can then apply Heat, while her Ultimate improves the team's Heat damage and reduces Laevatain's Combo Skill cooldown.

This pairing is especially attractive for players who already have a developed Heat roster. Rather than rebuilding an entirely new team around Si, you can use her as a support and damage amplifier for an established carry.

3. Si and Yvonne Cryo Team

• Yvonne: Deals Cryo-focused damage and consumes Cryo stacks to trigger Solidification.
• Si: Amplifies elemental damage and contributes Combo Skill bursts.
• Xaihi: Provides healing and additional Cryo application.
• Tangtang: Supports Cryo application and area damage against groups of enemies.

This lineup can maintain Cryo pressure while taking advantage of Si's Inksoul mechanic. Tangtang's area-oriented abilities complement Si's recorded-damage explosion, making the team worth considering for encounters with multiple enemies.

The key decision is the first team position. Si in slot one favors faster access to her own Combo Skill, while Yvonne in slot one prioritizes Yvonne's Combo Skill cooldown. Test both configurations after release to see which delivers better results for your available gear and rotation.

▍Si Skill Upgrade Priority

Si's damage and utility are closely linked to her Battle Skill, Combo Skill, and Ultimate. A sensible upgrade order should reflect how you intend to use her.

This is a provisional practical priority, not a confirmed numerical ranking. If you mainly use Si to support Laevatain or another carry, you may prefer to invest in the skills that most directly improve her support role after checking their final upgrade scaling.

▍FAQs about Si

1. Should Si be the first operator in the team?

For a Si-centered Cryo team, yes. Her Ultimate reduces the Combo Skill cooldown of the first-position operator, so placing Si first supports her own damage rotation. For a Heat team built around Laevatain, putting Laevatain first is a strong alternative.

2. Which operators work best with Si?

Xaihi, Arcane, Last Rite, Tangtang, Yvonne, and Laevatain are notable options. The best combination depends on whether you want to focus on Cryo or Heat damage, and whether your team needs more healing, elemental application, or burst damage.

3. Is Si suitable for free-to-play players?

She can be useful for free-to-play accounts that already have compatible Cryo or Heat operators. You do not need to obtain every premium teammate to make use of her elemental mechanics, although the final team performance will depend on your roster and equipment.

4. When will Si be released?

Si is scheduled to arrive with the Sanctuary of Ink Version 1.6 update on October 15, 2026. Her listed banner period ends on November 5, 2026. Check the in-game notices for the final server-specific schedule.

▍Conclusion

Si is a promising Cryo and Heat Supporter whose strength comes from elemental Infliction interactions, Combo Skill damage, and the unique Inksoul mechanic. Start with Jade Vessel and Type 50 Yinglung as provisional build choices, then prioritize a team that can consistently trigger her elemental combos.

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