ENDFIELD 1.3: HETONITE, WULING & DEPOT META

Two weeks into the Sketches of Lost Heirlooms cycle, the threads that fill the help megathread are not about Mi Fu’s combo or Sword Vault Dale’s secret chests. They are about a quieter set of systems that 1.3 reshaped without much announcement — the Hetonite component pipeline, the Wuling Development progression ceiling, and the new depot delivery rewards that occasionally pay out six-figure Stock Bill bonuses for routes players have run a hundred times before. If your factory feels suddenly sluggish, your Wuling Development meter has stalled near the cap, or you noticed a delivery NPC giving out an order of magnitude more cash than usual, the patch is not bugged. The endgame economy has shifted under your feet, and the players figuring it out first are the ones reading between the lines of the official notes.

This piece pulls together what the community has actually verified in-game during the first two weeks of 1.3 — the ratios behind Hetonite production, the level caps blocking the way to Wuling Development 18, the diamond-icon bonus deliveries that started showing up in depot routes after the update, and the practical resource budget for the new Cuprium and Ferrium ore additions. For the patch’s headline content, see our Arknights Endfield 1.3 Update Overview.

TL;DR — Key Points

• 80 Cuprium produces 1 Hetonite component — the chain runs 8:1 (Cuprium to Hetonite), then 5:1 (Hetonite to Parts), then 2:1 (Parts to Component). That’s the conversion players need to memorize before sizing any production line.
• You only need ~2,000 components over a patch cycle, not the 80,000 your blueprint is trying to build. Four armor pieces across roughly ten characters is the real demand — overproducing burns Cuprium for no payoff.
• Run components at 0.5 per minute, 24/7 — about 30 per hour, 200 in six hours, a full armor set on a single overnight tick. That’s the right pace for the actual demand curve.
• Wuling Development caps at 17 right now — Development 18 is gated behind a coming arena facility currently sealed behind unbreakable rocks in the patch map, expected to unlock in the second half of the 1.3 cycle.
• Depot delivery missions now have rare bonus payouts flagged by a small diamond / gem icon next to the recipient’s name — one community-reported drop paid out 163,000 Stock Bills on a single Wuling depot run.
• 1.3 added 120 extra Cuprium Ore and 30 extra Ferrium Ore per hour to the regional cap. The cleanest spend is a Yazhen / Jincao line A, not a half-rate Hetonite buffer.
• Delivery NPCs were repositioned across every region — the locations are the same but the people are different, and many routes now drop mail rewards on first-time deliveries.

The Hetonite Conversion Chain: Why It Costs 80 Cuprium per Component

The factory complaint dominating every megathread is the same one: blueprints that promised steady Hetonite component output are crawling, and the Cuprium reserves drain faster than the assemblers can refill them. The reason is the three-stage conversion chain that 1.3 did not change but that more players are running into for the first time as armor demand spikes.

The Three-Stage Ratio

The compounding is what catches players. A blueprint that calls for 200 Hetonite components is silently calling for 16,000 Cuprium at the upstream end of the line — and if the Cuprium feed is even mildly under-provisioned, every stage downstream slows in step.

For a deeper read on belt throughput and port discipline behind this kind of ratio, AIC Factory Optimization covers why underfeeding a single moulding machine at 50% utilization halves the entire downstream chain.

Why Community Blueprints Look Slow (And Why That Is Correct)

The first round of community Hetonite blueprints to circulate after 1.3 dropped were tuned for a specific output rate — roughly 0.5 components per minute, or 30 per hour. Players importing those blueprints expected an industrial torrent and got a trickle. The blueprints are not wrong. The expectations are.

The right read on a Hetonite line is not “maximum throughput per minute.” It is “minimum throughput that meets actual demand without overconsuming Cuprium.” The demand calculation looks like this:

• 4 armor pieces per character
• ~10 characters in a typical roster spend window per patch
• ~50 components per armor piece (rough community-averaged figure)

That’s ~2,000 components per patch cycle, full stop. A line running 30 components per hour clears that in 66 hours of total uptime across a roughly six-week patch — easy to hit while AFK, on dailies, or overnight. Anything faster is hoarding Cuprium that has higher-EV uses.

When Slow Lines Become Actually Slow

There is one case where a slow line genuinely is slow rather than correctly paced: the upstream Cuprium feed is not provisioned for the blueprint’s expected yield. If you just unlocked Hetonite and dropped a community blueprint designed for someone with a fully built-out Cuprium ore network, the blueprint will starve at stage 1 and stall every downstream stage. The fix is to size your Cuprium intake against the stage 1 input rate, not the stage 3 output rate.

A useful sanity check: a 0.5 components/min line needs roughly 40 Cuprium per minute flowing into the first converter. If your Cuprium ore feed is under 40/min, the blueprint will display its rated output rate on the assembler UI but never sustain it.

The Lifetime Component Budget: Stop at 2,000

The single highest-leverage mental model for Hetonite production is the lifetime budget. Most players who feel “stuck in the factory loop” are running into the same trap: they treat Hetonite components like Cuprium ore — a resource to stockpile indefinitely against future demand.

Hetonite components are not that kind of resource. They are armor-build currency, and the armor build is one-time-per-character per patch. Once your top ten operators have full Hetonite armor sets, the marginal value of the next 10,000 components is zero. The Cuprium and factory uptime spent producing them is a deadweight loss.

The Right Stockpile Target

The “disable the line” row is not a joke. If you have already armored every character you intend to play in the patch, the cheapest move is to shut the assembler off and redirect the Cuprium feed to Yazhen / Jincao or any of the new high-margin elastic goods coming online with the 1.3 area. The stock-market arbitrage routes covered in our Stock Bill Economy guide pay better per Cuprium spent than a fourth set of Hetonite armor for an operator you never play.

Wuling Development Cap: Why You Are Stuck Near 17

The second-most-common 1.3 question is the Wuling Development ceiling. Players who pushed hard during 1.2 and the early days of 1.3 are reporting the same wall: meter sitting 80–95% through level 17, every visible mission closed out, every recycling station upgraded, and no obvious source of the remaining XP.

The good news is the cap is not bugged. The less-good news is the unlock is gated behind a piece of content that has not gone live yet.

The Arena Facility Block

A new arena facility is sealed behind unbreakable rocks on the patch map and is expected to unlock during the second half of the 1.3 cycle, roughly in the same window as the Camille banner and the Contingency Contract challenge event. That facility is the missing Development XP source that pushes the meter from 17 to 18. Until the rocks crack, Development 18 is not achievable by any combination of side-mission or recycling-station play.

What Does Increase Development Right Now

For players sitting below 17, the path to the current cap is still entirely doable. The contributing sources, in order of yield:

• Sky King mission progression — the missing 4th level alone is roughly the gap between Development 15 and 16. If your Sky King chain is parked at level 3, you should be banking ~800 Development XP from the missions you have not yet picked up.
• Recycling station upgrades — every station tier above 3 adds incremental Development XP, not just throughput.
• Mining outpost setup — placing and connecting mining spots contributes a small but non-zero amount per spot.
• Regional development missions in adjacent areas — Valley IV and the western Wuling expansion zones both feed into the same Development meter.

Our RDM Valley IV Wuling Strategy walks through the specific mission chains that move Development XP fastest if you are below level 16.

Depot Deliveries: The Diamond Icon Bonus Missions

Then there is the depot delivery change, which is the single most under-reported addition in 1.3 because Hypergryph did not call it out in the patch notes. Players running their usual depot routes started noticing something off the morning after the patch dropped: one delivery slot would occasionally pay out a payload an order of magnitude larger than the rest. One community-confirmed run paid 163,000 Stock Bills on a single delivery to a Wuling city depot — the kind of number that usually requires a full week of weekly artificing exchange grinding.

The mechanic is real. Here is how to spot it.

The Diamond / Gem Icon

When you open the depot delivery menu, each recipient on the destination list now occasionally displays a small diamond or gemstone icon next to their name. That icon flags the bonus payout. Picking the diamond-flagged recipient routes the delivery to a high-reward variant of the standard mission — typically a multi-fold Stock Bill multiplier, sometimes paired with extra mail rewards.

There is also a small golden symbol (described variously as a star or crown) that can appear on the mission itself in the depot menu list, before you even open the recipient picker. If you see that mission-level icon, the delivery is one of the rare high-reward variants and worth prioritizing over the rest of the daily queue.

The icons are easy to miss because the depot UI puts the focus on the Stock Bill payout number, not the recipient list. Most players were skimming straight past the diamonds for the first 48 hours of the patch.

Why the Rewards Spike After 1.3

The bonus mission system did not exist in 1.2. It is a new addition tied to the Wuling Depot upgrades that 1.3 quietly extended, and the spike in reported high-reward drops is the first wave of community confirmation. The drop rate is low — roughly one bonus mission per 8–15 standard runs based on community sampling — but the payout differential is high enough that skipping the diamond-flagged recipient is a measurable loss of weekly income.

For context on how Stock Bills flow through the broader factory economy, our Depot Optimization guide covers the upgrade priorities that make the new bonus missions accessible at all.

NPC Reshuffle: New Delivery Recipients Across Every Region

The other quiet depot change is a region-wide NPC reshuffle. Every delivery location in the game now has a different recipient than it did in 1.2 — same coordinates, different person, slightly different placement within the same area. The mechanical effect is that every player gets first-time delivery rewards on routes they have already run, since the game treats each new recipient as a new contact.

The first-time rewards are typically mail-based: small Stock Bill bonuses, occasional Mark of Perseverance drops, and the occasional Headhunting Permit fragment. Running the full depot route once in the first week of 1.3 is worth doing even on a fully cleared route from the 1.2 cycle.

Resource Budget: The Extra Cuprium and Ferrium in 1.3

1.3 also raised the regional resource cap. The community-confirmed numbers are +120 Cuprium Ore per hour and +30 Ferrium Ore per hour, applied across the Wuling region. The debate inside the threads is what to do with the surplus.

Three Reasonable Plays

The community-consensus take is that half-rate Hetonite is the highest pure efficiency play only if you actually need the components. If you have already armored your active operators, the surplus Cuprium has higher Stock Bill EV in the Yazhen / Jincao trade route — particularly during the elastic goods price-peak windows that the new 1.3 area surfaced. Our Elastic Goods Trading Tiers guide covers the timing math.

Strategy by Player Type

For the Casual Factory Player

• Run one Hetonite line at 0.3 components/min and forget it. Twelve hours a day of uptime clears the patch’s armor demand without any further tuning.
• Check the depot delivery menu once per day and prioritize any diamond-flagged recipient on the daily route.
• Park Wuling Development at 17. Wait for the arena facility to unlock before grinding the last mile.

For the Mid-Game Factory Player

• 0.5 components/min Hetonite line, target 1,500 components by patch end, then disable the line and reroute Cuprium.
• Run depot routes daily, and always open every recipient on the list before picking — the diamond icon is the alpha.
• Push Sky King to level 4 if you have not — it is the cheapest remaining Development XP source under the level-17 cap.

For the Hyper-Engaged Factory Player

• Build a 0.5 components/min line for the patch and a parallel Yazhen / Jincao A line on the surplus ore for Stock Bill conversion.
• Audit the full depot recipient list across all three regions in the first week of the patch — the NPC reshuffle means first-time mail rewards on routes you already cleared.
• Pre-build the arena-facility access route so you are ready to grind Development 18 the moment the rocks crack.

For the Returning Player

• Don’t try to “catch up” on Hetonite components by overbuilding. The lifetime budget for the patch is ~2,000, and current pace clears that easily.
• Wuling Development 17 is reachable in a week of focused play. Run Sky King, upgrade recycling, place mining outposts.
• The Contingency Readiness event (June 12 — June 19) is the highest-value re-entry window in the patch. Stack Sanity Permits and use them on the new area.

Common Mistakes to Avoid

• Overproducing Hetonite components. The lifetime budget is ~2,000. Building 10,000+ burns Cuprium that has better uses. Disable the line once the stockpile is built.
• Skipping the depot recipient picker. The diamond / gem icon is small and easy to miss. Open every recipient list before confirming a delivery — the bonus payout differential is huge.
• Running a Hetonite blueprint without sizing the Cuprium feed. A blueprint rated at 0.5 components/min needs ~40 Cuprium/min upstream. If your ore intake is under that, the line will stall regardless of how the assembler UI displays the rate.
• Grinding for Development 18 right now. It is gated by content that has not unlocked yet. Park the meter at 17 and wait for the arena facility.
• Treating the +120 Cuprium / +30 Ferrium surplus as Hetonite input by default. It is only Hetonite input if you actually need more components. Otherwise it is Yazhen / Jincao input and Stock Bill output.
• Skipping the depot route in the first week of 1.3. The NPC reshuffle gives first-time delivery rewards on routes you already cleared. Running every region once is a one-time mail-bonus haul.

Watch List — What Could Change This Plan

• Arena facility unlock date and Development 18 XP source. When the unbreakable rocks crack, the Development XP source feeding 17 → 18 will be visible in the in-game meter. If the unlock is small (e.g., 200 XP), the grind is trivial. If it is a multi-day quest chain, plan around it.
• Bonus delivery drop rate tuning. Hypergryph has not officially acknowledged the diamond-icon bonus payouts. If the drop rate gets nerfed in a hotfix, the EV of running the full depot list daily drops sharply.
• 1.4 armor system changes. If 1.4 introduces a new armor tier above Hetonite, the lifetime component budget changes meaningfully. Hold a portion of Cuprium in reserve through the back half of 1.3 rather than committing all surplus to Stock Bill conversion.
• Camille banner factory demand. If Camille’s release adds a new factory-relevant material chain (Heat-related processing for Vanguard kits, for instance), the surplus Cuprium / Ferrium picture shifts again.

Final Read

1.3’s loud changes are Mi Fu’s Greatsword combos, Sword Vault Dale’s exploration loop, and the looming Contingency Contract opening. The quiet changes are where the patch’s actual economy lives — a Hetonite chain whose costs compound across three stages, a Wuling Development meter that genuinely caps at 17 until the arena facility opens, depot delivery missions that occasionally pay out six-figure Stock Bill bonuses if you check the recipient list before confirming, and a regional NPC reshuffle that gifts first-time rewards on routes you already cleared.

The pattern across all four is the same. Hypergryph added small, easy-to-miss systems on top of existing routines, and the players who get the most out of 1.3 are the ones who slow down enough to read what changed under the hood. Do not pad your Hetonite stockpile. Do not grind Development 18 yet. Do open every depot recipient list before confirming. The patch rewards attentive play, not just longer play.

FAQ

How much Cuprium does one Hetonite component cost?

80 Cuprium. The chain is 8 Cuprium → 1 Hetonite, 5 Hetonite → 1 Hetonite Part, 2 Parts → 1 Component. The ratios compound, so a 200-component blueprint silently costs 16,000 Cuprium at the upstream end.

Why is my Hetonite blueprint running so slowly?

Two likely causes. Either the blueprint is correctly tuned for ~0.5 components per minute (which is the right rate for actual armor demand), or your Cuprium feed is under-provisioned for stage 1 of the chain. A 0.5 components/min line needs ~40 Cuprium/min flowing in. If your ore intake is below that, every downstream stage stalls.

How many Hetonite components do I actually need?

Roughly 2,000 over the full 1.3 cycle — four armor pieces across about ten operators. Anything beyond that is over-stockpiling. Disable the line and redirect Cuprium to Yazhen / Jincao trade goods once you hit the target.

Can I reach Wuling Development 18 right now?

No. Development 18 is gated behind an arena facility that is currently sealed behind unbreakable rocks on the patch map. The facility is expected to unlock during the second half of the 1.3 cycle, in the same window as the Camille banner and Contingency Contract opening.

What raises Wuling Development between 15 and 17?

The biggest single lever is finishing the Sky King mission chain — pushing it from level 3 to level 4 alone is roughly the gap from Development 15 to 16. After that, recycling station upgrades, mining outpost placements, and the Valley IV regional development missions contribute incrementally.

What is the diamond icon in the depot delivery menu?

A small diamond or gem icon that appears next to certain recipients in the delivery destination list flags a high-reward variant of the standard delivery mission. Picking a diamond-flagged recipient can pay out an order of magnitude more Stock Bills than the standard route — community-confirmed drops have hit 163,000 Stock Bills on a single Wuling city depot run.

Is the depot bonus payout in the patch notes?

No. Hypergryph did not call out the bonus delivery system in the official 1.3 notes. It was discovered by community players in the first 48 hours of the patch and confirmed across multiple regions in the days after. The drop rate is roughly one bonus mission per 8–15 standard runs.

Did delivery NPCs actually change in 1.3?

Yes. Every delivery location still exists at the same coordinates, but the recipient NPC at each location is different and slightly repositioned. Because the game treats each new NPC as a new contact, players get first-time delivery mail rewards on routes they fully cleared in the 1.2 cycle.

What should I do with the extra 120 Cuprium and 30 Ferrium per hour?

If you still need Hetonite components, a half-rate Hetonite buffer is the highest-ratio play but leaves 15 Ferrium/hr unused. Once you are component-flush, a full Yazhen / Jincao A line spends both ores and produces tradeable Stock Bill income — typically the higher cash EV unless an upcoming patch is about to spike armor demand.

Should I keep my Hetonite line running 24/7?

Only until you hit your lifetime component target — about 2,000 components across roughly ten operators with full armor sets. After that, the line is burning Cuprium for no payoff. Shut it off and reroute the feed to elastic goods or Yazhen / Jincao trade output.