Arknights Endfield Si Preview: Feranmut Proxy Lore, Story Role and Possible Banner Timing

Si is, without question, the most talked-about unreleased character in Arknights: Endfield right now. First shown during the Version 1.2 "Spring's First Light" livestream, properly introduced in the Version 1.4 "Homecoming" story, and confirmed as one of the next headline units in the pipeline, the mysterious Feranmut Proxy has dominated community discussion threads, theory videos, and pull-planning spreadsheets. The reason is simple: Si is not just another Operator. She is a living bridge between the "Living Gods" of Terra and the industrial survival of Talos-II.

This guide compiles everything that is actually confirmed about Si — her origin as the 13th Proxy of the Feranmut Sui, her in-game story role, what the official livestreams have and have not revealed about her banner, and, most importantly for planners, a concrete Oroberyl saving strategy so you can secure her the moment her Chartered banner goes live. Where something is speculation, we label it as such. Where it is confirmed by official sources or the English wiki, we say so directly.

Who Is Si? The 13th Sui Proxy on Talos-II

Si's Identity and Origin — The Feranmut Sui

To understand Si, you first have to understand Sui. According to the English Arknights Endfield wiki, Sui (Chinese: 岁) is a Feranmut — an ancient, god-like being from Yan — and the last of its kind to be defeated and sealed during the "Great Hunt" of Yan, an event later recorded in Yanese history as the "Ennoblement of the Gods." Sui originally came from the "chaos" that predates even the stars, and like the rest of the Feranmuts, was targeted by the nation of Yan in an attempt to wrest control of their own fate from the so-called gods.

In an act of arrogance, Sui chose to betray its own kin and attempted to become the sole god of Yan. After the last of its kind were driven from Yanese soil, a badly wounded Sui was subdued by the True Lung of Yan and forced into slumber. Sui eventually fragmented into twelve original proxies, who — while initially serving as Sui's agents — achieved individuality by asking a single question: "Who am I?" Those proxies ultimately worked against their original Self to halt its reawakening, knowing that Sui's return would erase them all.

At some point in the Talosian Calendar — at least ten years before the present — a 13th proxy was born from Sui's body. That 13th Proxy is Si, and she currently resides on Talos-II working closely with the Hongshan Academy of Sciences. She currently resides on Talos-II and works closely with the Hongshan Academy of Sciences (HAS). Her Feranmut powers were a key component in the creation of the Feranmut Hearts, the artificial constructs that merge the pinnacle of HAS technology with Feranmutology, the academic study of Feranmuts.

Powers, Personality, and Visual Identity

Within the game's lore, Si is defined as the only known Proxy of Sui present on Talos-II. She wields the power of Ink and Scrolls, much like her older sisters Jie and Dusk. Despite her apparent age and nature, she is described as having a very childlike mentality and attitude. She is able to control Ink Spirits that take the form of butterflies, and she can create scrolls that defy natural physics — a power consistent with her nature as a Feranmut Proxy.

On the official character data side, the wiki lists Sui's attributes as: Gender — Agender; Race — Feranmut; Place of birth — Yan; Status — Unknown. What has NOT been revealed are Si's rarity, Operator class, attack element, and skill kit. No official in-game stats for a playable Si exist yet, and any leaked numbers circulating in community channels should be treated as unverified.

Si's Story Role in the Wuling Arc and Version 1.4 "Homecoming"

Debut in Yinglung Pass

Version 1.4, titled "Homecoming," launched on July 16, 2026, and serves as the climactic conclusion of the long-running Wuling storyline. The update added two new story regions: Yinglung Pass and the North Wuling Exclusion Zone. Yinglung Pass is described as the gateway to the sealed Wuling territory — and it is here that players meet Si.

Per GRYPHLINE's official site and multiple independent coverage sources, Si is "a mysterious Feranmut Proxy who guides them through the final enhancement of the Xiranite Nexus." In other words, she is not a background cameo. She is an active participant in the central technological objective of the entire Wuling arc: stabilizing the Xiranite Nexus so the Blight can finally be contained and the homeland reclaimed.

The Marker Stone and the Battle Against Ardashir

Si's importance extends beyond the Nexus. According to the wiki's story summary, the 13th Proxy was responsible for greatly aiding the Endministrator during the attempt to stop Ardashir from destroying the Marker Stone. She allowed the Endministrator to use the massive scroll within the structure to quickly reach its top, and she used her Ink Spirits to communicate directly with Arcane.

This places Si at the literal turning point of the Wuling climax — the moment where the player's faction, the people of Wuling, and the newly playable Arcane converge to deny Ardashir's plan. For a character who has not yet received her own banner, that is an unusually central narrative position, which is a big part of why the community expects her to be a headline release rather than a minor addition.

Feranmut Lore — Why Si Matters to Talos-II's Survival

Sui, the Great Hunt, and the Twelve Proxies

The Feranmuts are described in lore as "giants cloaked in the interstices of time." Their inherent "reason-rejecting" nature allows them to resist the informational breakdown caused by Aether — the hostile dimension that threatens all biological life on Talos-II. By integrating Proxy power into systems like the Tianshi Pillar Array, the HAS can artificially lower a region's Depth reading, pushing it away from the 0.5 danger zone and toward a more stable realspace state.

Si, as the 13th Proxy, occupies a unique niche: she is a manufactured bridge between the Living Gods of Terra and the industrial demands of Talos-II. The wiki explicitly frames her as "the ultimate weapon against the Blight." This is not generic flavor text — it is the in-universe justification for why the Hongshan Academy of Sciences keeps her so close, and why her powers were baked directly into the Feranmut Hearts used to suppress Blight within the Wuling region.

Feranmut Hearts and the Hongshan Academy of Sciences

The Feranmut Hearts trace their design origin back to Terra, where the Ninth Proxy, Nian, sought a way to keep herself and her siblings alive should Yan ever decide to be rid of Sui entirely. On Talos-II, however, the design was upgraded: these Hearts are integrated with Protocol-Originium technology and work in tandem to suppress the Blight within Wuling, with most of them found inside the Marker Stone.

For players, this lore has a practical implication. Si is not a character you pull "because she is cute" (though the childlike Ink-Spirit-butterfly aesthetic certainly helps). She is thematically and systematically tied to the single most important piece of endgame infrastructure in the Wuling region. That narrative weight strongly suggests her playable kit will involve support, control, or area-manipulation mechanics — but again, no official kit has been shown, so treat any specific prediction as community theory.

Possible Banner Timing — When Could Si Become Playable?

What the 1.4 "Homecoming" Livestream Revealed

During the Version 1.4 "Homecoming" livestream, GRYPHLINE showcased three upcoming heroes who have not yet been released: Si, the Hongshan Imperial Guard, and a Sarkaz Archer. Insiders have not guessed their attributes, rarity, or team positioning, and the development team has not revealed any concrete details. What we know for certain is the order in which they were presented and the fact that Si headlined that reveal.

Given that Si already debuted in the 1.4 story (Yinglung Pass) while Arcane and Liino became playable in the same version, the natural reading is that Si is the next major release after the 1.4 dual-banner cycle, with the Hongshan Imperial Guard and the Sarkaz Archer following later. This is consistent with how Hypergryph typically paces reveals: story introduction first, playable banner a version or two later.

Version Cadence and a Realistic Window

Arknights: Endfield ships major version updates roughly every 6–8 weeks. Version 1.4 "Homecoming" went live on July 16, 2026. If the cadence holds, Version 1.5 would realistically land in September 2026. That makes a Version 1.5 debut the most plausible window for Si's playable banner, though GRYPHLINE has not confirmed a date and could shift her to a later version if the development schedule changes.

The key planning takeaway: you very likely have at least one full version cycle (and the remainder of 1.4) to build your Oroberyl reserve. That is more than enough time to hit a guaranteed pull if you start now.

Oroberyl Saving Plan — How to Guarantee Si

The Real Cost: Pity, the 120-Pull Guarantee, and the Math

Arknights: Endfield uses Oroberyl as the premium currency for Operator Headhunting. The rates and pity structure, confirmed across multiple gacha guides, work like this:

A single pull costs 500 Oroberyl; a 10-pull costs 5,000 Oroberyl. To reach the 120-pull featured guarantee for Si — the only way to be 100% certain you get her — you need 60,000 Oroberyl banked before her banner ends. Critically, the 120-pull featured guarantee does NOT carry over between banners. If you do 119 pulls on a banner and don't get the featured unit, those pulls reset to zero when it ends. So the rule is absolute: either commit to 120 on Si, or don't start.

If you also want her signature weapon, note that weapons use a separate currency — Arsenal Tickets — not Oroberyl, so your Oroberyl budget is purely for the character. For the weapon, you earn Arsenal Tickets from operator pulls, the in-game store, weekly routines, and the Protocol Pass.

If you want to be fully prepared the moment Si's banner appears, you can top up your Oroberyl efficiently through Topuplist — the dedicated Arknights Endfield top-up portal is available at https://topuplist.com/product/arknights-endfield, and the main Topuplist storefront is at https://topuplist.com/. Buying ahead of a banner lets you skip the scramble and pull the instant she goes live.

Free Oroberyl Sources You Should Not Ignore

Endfield is notably generous with free Oroberyl, and the Half-Year Celebration tied to 1.4 proves it. GRYPHLINE's anniversary campaign awarded a three-day login granting 3,000 Oroberyl, 5 Basic HH Permits, and the free six-star weapon Farsight, plus an in-game mail package with 2,000 Oroberyl and development materials. Two separate 7-day login campaigns each provided 5 limited HH Permits.

On top of events, steady free Oroberyl comes from: main and side quests (every quest rewards Oroberyl), exploration treasure chests (15–60 Oroberyl each scattered across Talos-II), Authority Level milestones (50–100 Oroberyl per level), and Operational Manual node/daily/training challenges. One important efficiency tip repeated across guides: do NOT convert Origeometry directly into Oroberyl. Use Origeometry to upgrade the Protocol Pass instead — it returns far better long-term value.

A Week-by-Week Savings Target

Assuming Si debuts in early Version 1.5 (roughly a two-month runway from the 1.4 launch), here is a realistic savings trajectory toward the 60,000-Oroberyl guarantee:

Hitting 60,000 gives you the full 120-pull guarantee with a small margin. If you are willing to risk the 50/50 at the 80-pull hard pity (a random 6-Star with only a 50% chance of being Si), you could stop at 40,000 Oroberyl — but for a character this central to the story, most planners recommend the full guarantee.

For players who want to skip the grind entirely and lock in their reserve now, the Topuplist Arknights Endfield top-up page at https://topuplist.com/product/arknights-endfield is the simplest way to convert savings into a ready Oroberyl balance, with the full Topuplist catalog reachable from https://topuplist.com/.

Should You Skip Arcane or Liino to Save for Si?

The 120-Pull Reset Rule

This is the core decision every planner faces during Version 1.4. Arcane (Phase 1, July 16 – August 9) and Liino (Phase 2, August 9 – August 30) are both limited 6-Star banners. If you pull on either and fail to reach 120, that progress is lost when the banner ends. Therefore the strategic question is not "are Arcane and Liino good?" (they are) — it is "do they advance MY account enough to justify burning the Oroberyl I need for Si?"

A Practical Decision Framework

Use this matrix to decide:

The safest play for a Si-focused account is to skip both 1.4 banners unless a specific gap forces your hand, then enter 1.5 with a clean 120-pull guarantee ready. Remember the 60-pull Headhunting Dossier bonus: every limited banner you reach 60 pulls on grants a free 10-pull on the NEXT banner — but it expires if unused, so only chase it if you are already committed.

When the time comes, securing Si without the last-minute panic is easiest through a pre-planned top-up. The Topuplist Arknights Endfield portal at https://topuplist.com/product/arknights-endfield lets you fund your account in advance, and you can browse the wider Topuplist store at https://topuplist.com/ for other titles you play.

Final Verdict — Patience Pays for Si

Si is one of the best-documented "not-yet-playable" characters in Arknights: Endfield. We know who she is (the 13th Proxy of Sui), where she comes from (Yan, via the Great Hunt and the fragmentation of Sui), what she does in the story (guides the Xiranite Nexus enhancement and aids the Marker Stone battle against Ardashir), and roughly when she is likely to arrive (Version 1.5, based on the 1.4 reveal and the game's 6–8 week cadence). What we do NOT know — and should not pretend to — is her rarity, class, element, and kit. Anyone claiming exact stats is speculating.

For pull planning, the math is unambiguous. A guaranteed Si costs 60,000 Oroberyl (120 pulls), the featured guarantee does not carry over, and the free-Oroberyl economy of Version 1.4 gives you a genuine shot at banking that amount before she launches. Skip Arcane and Liino unless they fill a real roster gap, protect your 120-pull progress, and you will be ready the instant Si's Chartered banner opens. And when that banner finally goes live, having your Oroberyl already funded through the Topuplist Arknights Endfield top-up page at https://topuplist.com/product/arknights-endfield — part of the broader Topuplist store at https://topuplist.com/ — means you can pull immediately instead of scrambling at the deadline.

FAQ

Q: Is Si officially confirmed as a playable Operator in Arknights: Endfield?
A: Si has been officially shown in the Version 1.2 and 1.4 livestreams and appears as a story character in Version 1.4 "Homecoming" (Yinglung Pass). She has been confirmed as an upcoming hero, but her exact release version, rarity, class, element, and skills have not been revealed.

Q: What is Si's lore identity?
A: Si is the 13th Proxy of the Feranmut Sui, born from Sui's body and currently residing on Talos-II. She works with the Hongshan Academy of Sciences, wields Ink and Scroll powers, controls butterfly-like Ink Spirits, and was central to creating the Feranmut Hearts used to suppress the Blight in Wuling.

Q: When is Si's banner expected?
A: Based on the 1.4 "Homecoming" livestream reveal and Arknights: Endfield's roughly 6–8 week major-version cadence (1.4 launched July 16, 2026), Version 1.5 in September 2026 is the most plausible window. GRYPHLINE has not confirmed an exact date.

Q: How much Oroberyl do I need to guarantee Si?
A: To hit the 120-pull featured guarantee — the only way to be 100% certain — you need 60,000 Oroberyl (120 pulls × 500 Oroberyl). The 120-pull guarantee does NOT carry over between banners, so you must reach it within her banner's runtime.

Q: Should I skip Arcane and Liino to save for Si?
A: If your account already has strong Caster and Support coverage, skipping both 1.4 banners and banking the full 60,000 Oroberyl is the safest path to a guaranteed Si. Only pull Arcane or Liino if they fill a specific roster gap you cannot cover otherwise.

Q: Where can I verify Si's lore details?
A: The English Arknights Endfield wiki's Sui page documents the Feranmut lore, the twelve proxies, and the 13th Proxy's role, while GRYPHLINE's official site and the Version 1.4 "Homecoming" livestream provide the confirmed story and roadmap information.