Build de Si en Endfield: mejor arma, equipamiento, equipos y Potenciales (1.6)

The best Si build in Arknights: Endfield is her signature great sword Jade Vessel with three Type 50 Yinglung pieces (Soft Armor and two Beacons) plus Eternal Xiranite Gloves, leveling Brushwork Realm and Fully Envisioned first, with a Cryo or Heat operator in Team Position 01. That is the build Braxophone runs whether Si is the Main DPS or a support, and it matches this site’s Si build page, which also lists Jade Vessel first and Type 50 Yinglung as the core set.

This guide follows Braxophone’s 14-minute P0 Si video, uploaded October 18, 2026, three days after version 1.6 and Si’s Rejuvenation banner opened. Skill text, weapon stats and gear numbers are read off the game screens in his footage, not from the auto captions, which spell her name “Seu”, “Sue” and “Sir”. His team picks and opinions are credited to him. Every stat is checked against this site’s operator, weapon and gear data, and the two places where the video and the data disagree are pointed out where they come up. Banner dates are on our banners page.

What is the best Si build in Endfield?

One build covers both of Si’s jobs. Braxophone’s reasoning is that her personal damage stays high whether she sits in the Main DPS slot or supports another operator, so the same combo-skill gear pays off in either role.

What does Si do?

Si is a 6★ Cryo Supporter who swings a Great Sword. Her basic attack is a five-hit chain that deals Cryo DMG. Everything interesting happens in her battle skill, Brushwork Realm. The in-game text, at Rank 9, says Si deals Cryo DMG and applies Artful Intent, Immobilization and Cryo Infliction on the target, or Heat Infliction if a Heat operator is in Team Position 01.

Artful Intent records part of the damage the target takes. When it ends, the record bursts as Fixed DMG. After the cast, the battle skill turns into Initial Stroke for 15 SP, which pulls an Inksoul out of the marked enemy. Hitting the Inksoul hits its host too, though Braxophone checked that one attack landing on both only counts once. Cast again and Final Stroke throws the Inksoul back into its host for no SP and ends the effect early, so he warns against using it before the record is full.

Her combo skill, Fully Envisioned, triggers when an enemy’s Cryo or Heat Infliction is consumed or absorbed. Si summons an Ink Lung whose damage scales with the highest stacks of Arts Infliction taken from a single target.

Her ultimate, No One Spoils the Fun, calls a giant Ink Lung that deals Cryo DMG and grants Cryo Amp and Heat Amp to the whole team. That team-wide Amp is why she lifts older Cryo and Heat squads.

Which Si skills do you level first?

Braxophone splits her four skills into two pairs. Brushwork Realm and Fully Envisioned come first in every build and should reach max rank at about the same time. As a Main DPS, Si leans on the combo skill; as a support, the battle skill matters more because the Inksoul and Artful Intent are what she brings to the team. The second pair depends on the role: basic attack third and ultimate fourth for a Main DPS Si, the other way round for a support.

This site’s Si page orders them combo skill, ultimate, battle skill, basic attack. The two orders agree on the combo skill and differ on the battle skill, which Braxophone treats as equally urgent.

Why does Si need a Cryo or Heat operator in slot 1?

Brushwork Realm picks its Infliction from Team Position 01. Put a Heat operator such as Laevatain there and Si applies Heat Infliction instead of Cryo, which is what her Heat teams are built on.

Version 1.6 also added a combo skill priority setting. Its in-game description says it lets you “manually adjust combo skill casting priority” when several combo skills trigger at once.

Braxophone’s point is that the setting does not touch the battle skill’s Team Position 01 rule. Reordering combos is useful for every team below; the slot-1 operator still has to be Cryo or Heat.

What are the best Si teams?

Braxophone builds one Main DPS team and three support teams, each with its combo skill order shown on screen. The slot order below is his.

He is candid about the Main DPS version. You swap operators constantly, Si gets about one full basic chain per rotation, and without Arcane he would not run her as the Main DPS at all. Fluorite is the closest stand-in, “but you aren’t going to see the results that you want,” in his words. Measured honestly, the team is an Arcane and Tangtang team that features Si.

As a support, Si is easier to fit. Arcane only matters for the Main DPS version, so in the Yvonne and Last Rite teams Xaihi takes her place without much loss. The Heat team is where slot 1 matters: Laevatain stays first so Brushwork Realm keeps applying Heat.

In the Rossi team Gilberta is there for her ultimate only; the video’s caption says not to use her combo skill. When Arcane supports Si, Braxophone gears her with Rift Trekker Light Armor, Hot Work Gloves and two Hot Work Power Cartridges for the Hot Work set effect. Our best teams page lists the squads Prydwen ranks, for comparison.

What is Si’s best weapon?

Jade Vessel, her signature 6★ great sword. The weapon card in the video reads Base ATK 500, Intellect +156 and Cryo DMG +43.33%. Its effect raises ATK by 44.8%, and when the wielder applies Immobilization, the target takes 21% more damage for 30 seconds. Si applies Immobilization with every Brushwork Realm, so that debuff stays up.

The second half of the effect is easy to miss. After the wielder applies Immobilization or casts an ultimate, the next combo skill within 20 seconds gains 70% DMG Dealt. Fully Envisioned is Si’s biggest hit, so Jade Vessel feeds the skill that matters. All of these figures match this site’s Jade Vessel page at max refinement.

Long Heritage, the battle pass great sword, is second. It has the same Intellect and Cryo DMG lines, Main attribute +19.6%, and Cryo DMG Dealt for 20 seconds after the battle skill applies Cryo or Heat Infliction.

That 16.0% on Braxophone’s card and the 16.8% in the game data are the first disagreement; the data figure is the one on our weapon page. Long Heritage also gives the whole team Arts DMG Dealt when the wielder grants Arts Amp, which Si’s ultimate does.

For a 5★ option he names Seeker of Dark Lung, while admitting there is no great 5★ great sword. It gives Strength +124, Ultimate Gain +37.14%, Main Attribute +14% and ATK +16.8% for 30 seconds after an Arts Burst. This site’s Si page lists the 4★ Industry 0.1 as the budget pick instead.

He also mentions Khravengger, Last Rite’s signature, for a Main DPS Si. His advice is to give it back to Last Rite if you own both.

What is Si’s best gear?

Three Type 50 Yinglung pieces for the set effect: Wearer’s ATK +15%, and every battle skill any teammate casts gives Si one stack of Yinglung’s Edge, +20% DMG on her next combo skill, up to 3 stacks. The text is identical in this site’s gear data.

The pieces on screen: Type 50 Yinglung Soft Armor with INT +113, STR +75 and Combo Skill DMG Bonus +26.9%; Eternal Xiranite Gloves with INT +84, STR +55 and Ultimate Gain +26.7%; and two Type 50 Yinglung Beacons, each with INT +41, STR +27 and Combo Skill DMG Bonus +53.8%. The gloves are off-set on purpose, for ultimate charge.

Braxophone tested the full 1.6 Eternal Xiranite set and found it weaker on Si. His two variations: for more ultimate charge, Type 50 Yinglung Gloves plus an Eternal Xiranite Power Core in place of one Beacon; for none, Redeemer armor with the Type 50 gloves and Beacons. He still recommends the main build, because the set effect only pays when teammates cast battle skills before Si’s combo.

Which Si Potentials are worth it?

Braxophone plays her at P0 and calls that fine. The Potentials he singles out are P1, which improves Brushwork Realm (+50% Immobilization duration, +7% Artful Intent record ratio, +40% burst radius in the game data); P3, which multiplies the ultimate’s damage and Amp by 1.2; and P5, which cuts the combo skill cooldown by 2 seconds and counts one extra stack of Infliction.

That is the second disagreement. The Potential panel in the video shows the combo damage multiplier as 1.5 times, while Braxophone says 1.15 aloud and this site’s data, read from the game files, has 1.15. This page uses 1.15 until a clearer capture settles it.

His own damage sheet puts numbers on it. Against P0 at 100%, P1 reaches 105.77%, P2 120.37%, P3 126.76%, P4 134.00% and P5 158.91% of Si’s personal damage in his test rotation.

His reading: P1 and P5 help a Main DPS Si most, P3 helps a support Si most, and a low spender who wants her on the field can stop at P1. These are his test figures, not game text.

Should you pull for Si?

Braxophone’s answer is yes for most accounts, with a clear ranking of reasons. Pull if you already own Arcane and want a new Main DPS. Pull if you have an older Cryo or Heat team to revive: Laevatain, Yvonne and Last Rite all gain from her Amp. In his words she is “not a must-have character, but very good where she’s meant to perform.”

The banner math is on our side of the line. Si’s Rejuvenation banner closes on November 5, 2026, when Argent Flow’s banner opens, and our tier list places her at T0, in both the Main DPS and Support columns. Tangtang’s rerun, which runs to November 19, is the other 1.6 pull worth weighing, and Si’s best teams use her too; our Tangtang rerun guide covers it.