When you have pulled Si, the 6-star Cryo Supporter and 13th Sui Proxy who headlines the Sanctuary of Ink update, the last thing you want is to stare at her skill screen while your stockpile of Protodisks and Protoprisms sits empty. Her Artful Intent recording mechanic, Inksoul decoy, and team-wide Cryo/Heat Amp turn her into a flexible damage engine or amplifier depending on whether she sits in the first team slot. But none of that power materializes without the right Arknights Endfield Si materials. This Arknights Endfield Si materials guide will teach you what you want so you can get her online without wasting Sanity.
One thing before you start. If you want extra Oroberyls or Sanity Boosters to keep Protocol Space runs flowing while you chase her signature Jade Vessel or stockpile materials during the limited Rejuvenation banner window, topping up Arknights Endfield through Enjoygm gives you a fast, discounted route that keeps your farming pace high without the usual store markups. Make sure you do this before pulling her for more resources collected.
A Quick Overview to Arknights Endfield Si
Arknights Endfield Si arrives as a Greatsword-wielding Cryo operator from the Hongshan Academy of Sciences whose kit rewards both personal damage and team support. Placing her in the first team slot lets her apply the element of that lead operator while recording damage into Artful Intent for a large Fixed DMG burst; recasting pulls the stationary Inksoul that mirrors every hit and status back to the host.
Outside the first slot she leans harder into amplification and Combo Skill triggers. Si’s Combo Skill Fully Envisioned fires when Cryo or Heat Infliction is consumed or absorbed and her Ultimate grants team-wide Amp. So she slots cleanly into Cryo cores with Arcane or Heat cores with Laevatain and Yvonne. Getting Si there starts with the standard Endfield progression materials that every 6-star demands, plus the new resources tied to the Wuling Si’s Painting area that opens with Version 1.6.
Si Promotion Materials and Level Cap Breakpoints
Every operator in Arknights Endfield uses the same promotion brackets, and Si is no exception. You raise her level to the current cap, then spend Protodisks or Protosets plus rare growth materials to unlock the next bracket.
The early brackets stay light, but the jump to level 80 and 90 burns through Protosets and Bloodcaps quickly if you plan to take her into endgame content such as Umbral Monument or the new painted exploration zones.
So for the promotion materials for Si, this is what you will need:
| Promotion | Level Cap Unlocked | Protodisk / Protoset | Rare Growth | Approx. T-Creds |
| I | 40 | 8 Protodisk | 3 Pink Bolete | 1,600 |
| II | 60 | 25 Protodisk | 5 Red Bolete | 6,500 |
| III | 80 | 24 Protoset | 5 Ruby Bolete | 18,000 |
| IV | 90 | 36 Protoset | 8 Bloodcap | 100,000 |
Pink Bolete nodes sit in early Valley IV rare growth spots, Red Bolete appears around Originium Lodespring, and Ruby Bolete plus Bloodcap concentrate in Wuling regions once you push the main story into Si’s Painting.
Protocol Space: Promotions near the Core AIC Area remains the most consistent source for both Protodisks and Protosets; higher difficulties shift the drop ratio toward Protosets. Because these materials are shared across every operator you plan to raise, it pays to clear the promotion Protocol Space daily even before you own Si so the stockpile is ready the moment the banner drops.
Operator EXP Materials for Leveling Si to 90
Leveling Arknights Endfield Si from 1 to 60 relies on Combat Records, while Cognitive Carriers take over once you break into the 60+ brackets. The single best daily source is Valley Pass Sub-PAC on Difficulty 4, which drops a healthy mix of both.
The Manufacturing Cabin on the OMV Dijiang also produces them passively once you assign operators, so keep that running in the background while you explore the new painted area. Approximate totals sit around 1.7–1.8 million EXP to reach level 90, which means several days of focused farming plus passive generation if you want her fully online during the Rejuvenation window that ends November 5, 2026.
Skill Upgrade Materials and Priority for Si
Si’s skills scale in the usual way: Protoprism and Protohedron carry every skill from level 1 to 9, with higher mastery ranks adding Kalkodendra, Chrysodendra, Vitrodendra, Marks of Perseverance, and gold-tier items. Protocol Space: Skills, again located near the Core AIC Area, is the primary farm. Overworld nodes for the plant materials fill the gaps.
Skill priority for most players is Battle Skill (Brushwork Realm) ≥ Combo Skill (Fully Envisioned) ≥ Ultimate > Basic Attack. The Battle Skill is the heart of her Artful Intent and Inksoul loop, while the Combo Skill delivers the big Ink Lung damage once Inflictions are consumed.
If you plan to run her as a main DPS in the first slot, invest a few extra levels into the Basic Attack; pure support builds can leave it lower. The event “All the Inky Hues” and the Yuanyuan’s Blazing Stoves inn management in Si’s Painting both hand out Marks of Perseverance, so clear those early for free skill mastery progress.
Jade Vessel Weapon Materials and Tuning Path
Si’s signature 6-star Greatsword, Jade Vessel, applies a damage-taken debuff and boosts Combo Skill damage, making it the clear best-in-slot. The Battle Pass alternative Long Heritage offers solid Arts Amp and personal damage if you miss the signature. Weapon tuning follows the standard track:
| Tuning Stage | Cast Die / Heavy Cast Die | Rare Ore | T-Creds |
| 20 → 40 | 5 Cast Die | 3 Kalkonyx | ~2,200 |
| 40 → 60 | 18 Cast Die | 5 Auronyx | ~8,500 |
| 60 → 80 | 20 Heavy Cast Die | 5 Umbronyx | ~25,000 |
| 80 → 90 | 30 Heavy Cast Die | 8 Wulingstone + high-tier items | ~90,000 |
Protocol Space: Weapon Tune near the Originium Byproduct Processing Center supplies the Cast Die family. Kalkonyx, Auronyx, and Umbronyx are world collectibles in Valley IV, while Wulingstone appears once you reach the painted Wuling zones. Weapon EXP itself comes from Arms INSP Sets, Kits, and Inspectors, which drop broadly from weapon-focused Protocol Spaces and can also be produced in the AIC.
Efficient Farming Routes and Si’s Painting Opportunities
Prioritize these nodes in roughly this order for Arknights Endfield Si materials while the Rejuvenation banner is live:
- Protocol Space: Promotions and Skills (Core AIC Area) for Protodisks, Protosets, Protoprism, and Protohedron.
- Valley Pass Sub-PAC Difficulty 4 for Combat Records and Cognitive Carriers.
- Weapon Tune Protocol Space for Cast Die progression.
- Overworld rare growths and ores in Valley IV then Wuling as story unlocks them.
- Event shops and AIC Quota Exchange for limited extra Protodisks or Marks of Perseverance.
Version 1.6 adds the Auto-Farmer that automates germinating and harvesting in Si’s Painting and later Wuling City farm plots, plus a top-down planting view and tighter spacing. Once the main story reaches Chapter II Process VIII “Paint with Fresh Ink,” you can stockpile plant materials far more efficiently. The same update improves Cabin Shift Rotation and lets expired Sanity Meds convert automatically, so keep your daily Sanity topped up.
If you want the extra daily runs that turn those Protocol Space loops into a reliable pipeline for Si’s character materials and Jade Vessel tuning pieces, a Monthly Pass plus occasional Sanity Boosters makes a noticeable difference. Enjoygm remains a practical way to secure those resources at a discount so you can keep the farms running while the limited banner window is open.
Gear follows similar logic. Type 50 Yinglung is the expected set for maximizing her Combo Skill damage given her Intellect main and Strength sub attributes. Soft armor pieces lean into personal DPS builds, while heavier options or Eternal Xiranite Power Cores suit pure support setups. The new Gear Plan feature lets you save multiple loadouts so you can swap between DPS and amplifier configurations without constant re-crafting.
Putting the Stockpile to Work
Once the Arknights Endfield Si materials are in hand, the real payoff is seamless rotations. Apply Artful Intent, let the team pile damage into the recording window, recast for the Inksoul so every hit lands twice, then trigger Fully Envisioned on the Consume. The new area’s Auto-Farmer and event rewards simply accelerate the material side of that loop. Clear the Combat Drills trial for the free geared set and Oroberyls, finish the sign-in for Spirit’s Restoration permits, and treat the Token of Si milestones as a long-term safety net rather than a day-one plan.
Conclusion
And that is all for the Arknights Endfield materials. With the promotion, skill, and weapon materials mapped, Si stops being a “wait for the farm” operator and becomes the flexible Cryo Amp engine Version 1.6 was built around. Build her to the best while you can with these totals of materials and you will soon see the pay off.
