How to Get Cast die in Arknights: Endfield and Push Weapons Past Level 40

What to know

• Cast Die is used for weapon tuning to increase a weapon’s level cap (including pushing past level 40 when the game asks for it).
• The main farm method is Protocol Space: Weapon Tune at Threat Level 1 or higher; rewards require Sanity to claim.
• Extra sources include story/side quest rewards and exploration chests across Talos-II.
• Cast Die can also be bought from the AIC Quota Exchange store for 16 AIC Quota.

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After hitting the level 40 wall, progression usually becomes material-gated rather than EXP-gated, so the goal is to consistently route Sanity into the right Protocol Space and fill gaps with missions, exploration, and exchange purchases.

Quick reference table for Cast Die farming

Method	Where it comes from	Cost/Limit	Why it matters
Protocol Space farming	Protocol Space: Weapon Tune (Threat Level 1+) chest rewards	Requires Sanity to enter/claim rewards	Best repeatable source when pushing weapon caps past 40.
Missions	Story missions, side quests, and other mission types can reward Cast Die	Depends on mission availability	Good for early stockpiling while progressing naturally.
Exploration	Chests found while exploring Talos-II	Limited by chest availability	Helpful supplemental source when short by a few.
Exchange store	AIC Quota Exchange store (16 AIC Quota)	Limited by quota income/store stock	Reliable “top-up” option when farming is slow.

Where Cast Die is used and why level 40 gets stuck

Cast Die is categorized as a progression material used to tune weapons and increase their level cap alongside other materials.
When a weapon (or related upgrade track) demands Cast Die at a threshold, leveling won’t resume until the tuning/promotion requirement is met, even if plenty of EXP items are available.

How to farm Cast Die using Protocol Space: Weapon Tune

Protocol Space: Weapon Tune is the key activity because it directly lists Cast Die as an obtainable reward at Threat Level 1 or higher, and it is designed to be repeatable as long as Sanity is available to claim rewards.

Step 1

Progress far enough in the game systems to access Protocol Space activities, then locate Protocol Space: Weapon Tune in the Protocol Space list.

Step 2

Select Weapon Tune and set the run to Threat Level 1 or higher, since Cast Die is tied to Threat Level 1+ completion rewards.

Step 3

Complete the encounter and open/claim the reward chest, since the material is obtained from completion rewards rather than from overworld gathering nodes.

Step 4

Spend Sanity to claim the rewards from the rift/chest; without spending Sanity, the rewards (including Cast Die) won’t be collected.

Step 5

Repeat runs as needed until the required Cast Die count is met, then return to the weapon tuning menu and apply the tuning/promotion to raise the level cap and continue leveling.

How to speed it up with quests, exploration, and exchange

Some story missions and side quests can drop Cast Die on completion, so clearing active objectives can reduce the number of Protocol Space runs required.
Exploration also matters because Cast Die can appear in chests found while exploring Talos-II, which can be a quick way to finish an upgrade requirement without additional Sanity spending.
If the remaining shortfall is small (or Sanity is tight), buying Cast Die from the AIC Quota Exchange for 16 AIC Quota is a direct way to complete the requirement.

Reward table (what gets awarded)

Activity	Reward type	What gets awarded after completion
Protocol Space: Weapon Tune (Threat Level 1+)	Weapon tuning material	Cast Die can be awarded as a completion reward (claimed via Sanity).
Mission completion	Progression rewards	Cast Die may be awarded from story/side quests and other missions.
Exploration chests	Chest loot	Cast Die may be found in chests while exploring Talos-II.
AIC Quota Exchange	Store purchase	Cast Die purchased for 16 AIC Quota.

Getting past the level 40 cap efficiently

The most consistent path is to prioritize Protocol Space: Weapon Tune runs whenever Sanity is available, then use mission clears and exploration to reduce how many Sanity-funded claims are needed.
When only a small number of Cast Die remains, the AIC Quota Exchange purchase option can finish the requirement without more farming.

Finishing the Cast Die grind smoothly

Once enough Cast Die is obtained, applying weapon tuning to raise the weapon’s level cap is what unlocks continued leveling past the level 40 threshold.
Keeping a steady loop of Weapon Tune runs, plus periodic questing and chest routes, prevents repeated stalls at future caps that also request tuning materials.