Valley Engraving Permit Arknights Endfield: How to Get and Use It

What to know

• Valley Engraving Permit directly influences Essence stat rolls, not cosmetic bonuses
• It only works in Valley IV Severe Energy Alluvium sites
• You can guarantee specific attributes and one secondary stat per Essence
• When combined with Sanity Usage Permits, it becomes the core endgame farming loop

---

If you’ve pushed deep enough into Arknights Endfield to unlock Valley IV, you’ve likely already felt the wall that random Essence farming creates. You run Severe Energy Alluvium sites repeatedly, burn through Sanity, and still walk away with Essences that miss the stats your operators actually need.

The Valley Engraving Permit exists to fix that exact problem.

This guide explains what the permit really does, where to get it, how to use it correctly, and—most importantly—which stats are actually worth engraving so you don’t waste one of the rarest optimization items in Endfield.

Arknights Endfield Valley Engraving Permit details

Category	Details
Item name	Valley Engraving Permit
Unlock requirement	Valley IV access
Usage location	Severe Energy Alluvium – Originium Science Park
Core function	Pre-engrave Essence stat pools
Best use case	Flawless Essence endgame farming

What the Valley Engraving Permit actually does

Normally, Essence drops in Endfield are entirely random. You clear an Alluvium site, claim rewards, and hope the stat combination lines up with your operator’s build.

With a Valley Engraving Permit, that randomness is partially removed.

When you activate a Severe Energy Alluvium node with the permit, the game allows you to pre-define the stat pool from which the Essence will roll. You are not choosing exact numbers, but you are forcing the system to include specific stats.

Selection stage	What you choose	Result on the Essence
Attribute pool	3 core attributes	One is guaranteed
Secondary pool	1 secondary or skill stat	Guaranteed
Final stat	None	Remains RNG

This turns pure RNG into controlled RNG, which is exactly what endgame optimization requires.

Where to get Valley Engraving Permit in Arknights Endfield

The permit is purchased from the Valley IV Stock Redistribution Terminal, which becomes available once Valley IV is unlocked.

Item	Location	Cost	Stock
Valley Engraving Permit	Valley IV shop	400,000 Valley Stock Bills	Limited

The shop inventory rotates, and the permit occasionally appears at a discount. If you see it discounted, buy it immediately. There is no cheaper or faster alternative source.

Where the permit can be used

The Valley Engraving Permit is not global. It only functions at one specific activity:

Severe Energy Alluvium – Originium Science Park (Valley IV)

When interacting with the Alluvium node, a new option appears:

Current Pre-Engrave Stats → Select

If you don’t see this option, the permit is either missing or you’re at the wrong Alluvium site.

How to use Valley Engraving Permit correctly

Step 1: Travel to Originium Science Park Alluvium

Open the Valley IV map and track the Severe Energy Alluvium node.

Step 2: Open the Pre-Engrave Stats menu

Before starting the fight, select the engraving option added by the permit.

Step 3: Choose three attribute stats

You are selecting a pool, not a guarantee for all three.

• Agility Boost
• Strength Boost
• Will Boost
• Intellect Boost
• Main Attribute Boost

One of these will always appear on the Essence.

Step 4: Choose one secondary or skill stat

This stat is fully guaranteed.

Damage and utility stats	Skill stats
Physical DMG Boost	Suppression
Arts DMG Boost	Pursuit
Elemental DMG Boosts	Inspiring
Critical Rate Boost	Combative
Ultimate Gain Boost	Medicant
—	Efficacy

Step 5: Confirm engraving

This consumes one Valley Engraving Permit.

Step 6: Clear the Alluvium battle

Essence rewards now roll using the engraved stat pools.

Using Sanity Usage Permit for maximum value

The permit becomes truly powerful when paired with Sanity Usage Permits.

Claim option	Cost	Result
Normal claim	70 Sanity	Standard rewards
Enhanced claim	Sanity Usage Permit + 140 Sanity	Double rewards

Because your Essences are already pre-engraved, doubling rewards effectively gives you double chances at near-perfect stat rolls. This interaction defines Endfield’s late-game farming meta.

What rewards you actually get

A single engraved run can yield:

Reward type	Notes
Flawless Essences	Main optimization target
Pure Essences	Secondary enhancement
Operational EXP	Passive gain

The value comes from stat quality, not quantity.

Best stat picks (don’t waste permits)

Universal optimal engraving setup

Slot	Recommended stat	Reason
Attribute	Main Attribute Boost	Highest scaling
Attribute	Strength or Intellect	Core DPS
Attribute	Agility	Speed and uptime
Secondary	Physical DMG or Critical Rate	Works on most builds

Skill-focused operators

Secondary stat	Benefit
Ultimate Gain Boost	Faster cycles
Efficacy	Stronger effects
Inspiring	Team value

Elemental damage builds

Build type	Best stat
Electric	Electric DMG Boost
Cryo	Cryo DMG Boost
Nature	Nature DMG Boost
Arts	Arts DMG Boost

Why Valley Engraving Permit is endgame-defining

Without the permit, Essence farming is pure chance. You spend Sanity hoping RNG cooperates.

With the permit, you shape the outcome.

This is the point where Endfield transitions from leveling gameplay to true build crafting. Players who ignore the permit fall behind not because of skill, but because they’re rolling against unnecessary randomness.

When you should and shouldn’t use it

Use Valley Engraving Permits only when:

• Operators are level 60+
• You are farming Flawless Essences
• You are optimizing final builds

Do not use it early. The permit’s value scales with your progression.

Ideal Valley IV farming loop

Phase	Action
Preparation	Buy permits from shop
Setup	Pre-engrave optimal stats
Combat	Clear Alluvium
Claim	Use Sanity Usage Permit
Repeat	Chase near-perfect rolls

Why this item changes Essence farming forever

The Valley Engraving Permit is not a minor convenience—it’s stat manipulation. It’s the system Endfield uses to reward players who plan builds instead of gambling on drops.

If you’re serious about Valley IV progression, this item is mandatory.

This is the moment RNG stops controlling your builds—and starts working for you.