Si Guide and Best Builds

Si Guide & Best Builds

Welcome to our Si build guide for Arknights: Endfield. Si is a 6-star Great Sword Supporter Character available in Arknights: Endfield who utilizes the Cryo element.

Si's Best Weapons

Jade Vessel

• Intellect [L] +156.0 (9/9)
• Cryo DMG [L] +43.33% (9/9)

Efficacy: Dabbles of Ink:
ATK +25.6%. When the wielder applies Immobilization on the enemy, the target enemy suffers DMG Taken +12% for 30s. When the wielder applies Immobilization on the enemy or after the wielder casts an ultimate, the next combo skill cast within 20s gains DMG Dealt +40%. The two effects apply separately and do not stack with themselves.

Long Heritage

• Intellect [L] +156.0 (9/9)
• Cryo DMG [L] +43.33% (9/9)

Efficacy: Secret History:
Main attribute +11.2%. When the wielder's battle skill applies Cryo Infliction or Heat Infliction, the wielder gains Cryo DMG Dealt +9.6% for 20s. When the wielder grants Arts Amp to another operator in the team, the entire team gains Arts DMG Dealt +6.4% for 20s. The two effects apply separately and do not stack with themselves.

Seeker of Dark Lung

• Strength [M] +124.0 (9/9)
• ULT Efficiency [M] +37.14% (9/9)

Detonate: Seeker of the Esoteric:
Main Attribute +14%. When the wielder applies an Arts Burst, the wielder gains ATK +16.8% for 30s. Max stacks for effects of the same name: 3. Duration of each stack is counted separately. Effect only triggers once every 0.1s.

Industry 0.1

• Strength [S] +93.0 (9/9)
• ATK [S] +23.4% (9/9)

Suppression: Emergency Boost:
When the wielder's battle skill hits the enemy, the wielder gains ATK +33.6% for 20s. Effects of the same name cannot stack.

Si's Best Essences

Essences are one of the repeatedly farmable ways to further boost the weapon effects of your Si. Which area and essence you will want to farm will depend on the weapon you are playing, as not all Essences are compatible with every weapon. Essences will increase the stats of your weapon, as well as enhance the passive effect it provides. Note that there are more spots available to farm these Essence combinations, listed below you will find one per main zone.

• Jade Vessel: Intellect, Cryo DMG, Efficacy, farmable in: Valley IV: The Hub and Wuling: Sword Vault Dale
• Long Heritage: Intellect, Cryo DMG, Efficacy, farmable in: Valley IV: The Hub and Wuling: Sword Vault Dale
• Seeker of Dark Lung: Strength, ULT Efficiency, Detonate, farmable in: Valley IV: The Hub and Wuling: Wuling City
• Industry 0.1: Strength, Attack, Suppression, farmable in: Valley IV: The Hub and Wuling: Yinglung Pass

Best Gear for Si

Type 50 Yinglung

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).

Leveling Gear for Si

Aburrey's Legacy

3-piece set effect: Wearer's Skill DMG +24%. When the wearer casts a battle skill, combo skill, or ultimate, the wearer gains ATK +5% for 15s. The buff from each of the three skill types is unique and does not stack with itself.

Mordvolt Insulation

3-piece set effect: Wearer's Intellect +50. When the wearer's HP is above 80%, Arts DMG +20%.

AIC Light

3-piece set effect: Wearer's HP +500. After the wearer defeats an enemy, the wearer gains ATK +20 for 5s.

Si's Skill Priority

Si being classified as a Supporter operator is a bit of a misnomer. Her only true support features are the Amps provided through her Ultimate. In reality, she "supports" by providing a Damage duplicator in her Artful Intent and Inksoul, and her own finisher that feeds off of Strikers using their finishers.

This is best done by focusing on the output of Si's Combo Skill, which is fueled and reinforced by her Combat Skill, then her Ultimate. Her Basic Attack is fine to invest in if she's played as your controlled Operator.

How to Play Si

Team Slots Matter

Si features mechanics that adjust based on her positioning in the team assignment menu. Her Battle Skill applies Cryo Infliction by default, but will apply Heat Infliction instead if the first member of the team is Heat. Additionally, she has a Talent for reducing the cooldown of the Combo Skill of the first member of the team after Si uses her Ultimate.

Si's playstyle is built around doing damage by doing damage. Sounds funny and simple enough, right? Well, there's a bit more to it, so let's dive in.

• Step 1: Build Cryo Infliction or Heat Infliction on a target. The more the better. For the last intended Infliction, try to use Si's own Battle Skill - twice, to summon the Inksoul target.
• Step 2: Consume or absorb those Inflictions. This may be done by either having a Striker consume/absorb them, depending on the Operator's kit, or by performing an Arts Reaction, such as Corrosion. This will trigger Si's Combo Skill.
• Step 3: Use Si's Combo Skill to deal exorbitant amounts of damage. At this point, you've performed Si's typical rotation. Finish using the rest of your operator's rotations, and at the end of its duration the Inksoul will detonate, dealing a massive amount of damage to the main-target scaling off of the amount of damage dealt to the Insoul itself.
• Step 4: Use Si's Ultimate, dealing another massive hit. After her Ult, her Talent will refresh her Combo Skill again.
  • Note: You will need to build up Inflictions again after her first Combo Skill, and then consume those Inflictions again, or you won't be able to gain the max benefit of this second Combo Skill within the same Inksoul duration.
• Step 5, activate Si's Combo Skill once more, then either allow the Inksoul to expire on its own, or use Part 3 of her Battle Skill to manually detonate the Inksoul.

It quickly becomes clear what some of the biggest mistakes are. First off, do not spam her Battle Skill like you might be used to with other Operators. Once you've cast it twice, re-using it again will immediately cause the Inksoul to detonate, so avoid this at all cost.

You might also be tempted to build up max Inflictions before each Combo skill. While that might be optimal, it is more important to get the cast in before the Inksoul detonates, so make sure to cast it early enough, or you might lose out on quite a bit of damage, especially with the Combo Skill that becomes castable after her Ultimate.

Si's Best Teams

To learn all about Si's synergies and best team compositions, check our dedicated Si team page below:

ReinTenebrae

Guide Author

Follow ReinTenebrae

Rein Tenebrae is a passionate writer for Icy Veins, focusing on the Arknights: Endfield category. With a keen eye for tactical gameplay mechanics, character builds, lore breakdowns, and AIC factory optimization, Rein delivers comprehensive guides and strategies to help players thrive in the post-apocalyptic world of Talos-II. A fan of the Arknights universe since its January 2020 Global debut, Rein combines analytical insights with community-driven tips to keep readers ahead of the curve.

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