Operator Progression & Strategic Resource Allocation Guide | Arknights: Endfield Blog

The investment landscape within Arknights: Endfield is governed by a complex hierarchy of interconnected systems where the allocation of Sanity and secondary currencies determines the efficiency of power scaling. Unlike its predecessor, Endfield introduces a multi-layered progression model that includes character leveling, elite promotions, skill rank advancement, weapon tuning, and a highly randomized essence engraving system.

Each of these sectors demonstrates unique cost-to-benefit ratios and distinct thresholds of diminishing returns that necessitate a granular approach to resource management. The overarching objective for any operator is to navigate the transition from early-game baseline competence to late-game optimization while avoiding the “Sanity traps” inherent in high-level vanity upgrades.

TL;DR - Investment Priority Hierarchy

Level 60 / Elite 3 is the Golden Milestone — Mandatory threshold for Gold (T4) gear. Costs ~470 Sanity vs ~2,000 Sanity for levels 80-90. Gold gear set bonuses outweigh dozens of character levels.
Skill Rank 9 is the Sweet Spot — Rank 7 for universal efficiency, Rank 9 for functional baseline power. Rank 12 (Mastery) costs 5,000+ Sanity and rare Crowns for only 15-20% damage gain.
Weapon Level 80 is Optimal — Provides base ATK foundation for all multipliers. Level 90 costs 1,500 additional Sanity for marginal returns on non-hypercarry units.
Essence 4/4/2 is Practical Endgame — Perfect 3/3 match with 4/4/2 etching provides 85-90% of max power at <40% of total resource cost.
Avoid Terminal Diminishing Returns — Level 80-90 (14% gain for 2,000 Sanity), Skill 9-12 (20% gain for rare Crowns), Etch 5-6 (2.7% success rate) are Sanity traps.
Attributes > ATK% > Crit — Damage formula is multiplicative. Primary Attribute bonus is separate multiplier applied after ATK%. Crit stats are locked at +50% base damage.

Hierarchical Framework of Operator Development

The foundational layer of operator viability is established through character experience and promotion. This system serves as the primary gatekeeper for all subsequent power systems, including the ability to equip high-tier equipment and access advanced skill nodes.

Progression Phase Breakdown

Phase	Levels	Sanity Investment	Milestone Achievement	Strategic Priority
Early	1-20	<100 Sanity	Basic Kit Access	Universal
Mid	20-60	~470 Sanity	Gold Gear Eligibility	Core Team
Late	60-80	~1,200 Sanity	Skill Rank 9 Cap	Primary DPS/Sub-DPS
Maximum	80-90	~2,000 Sanity	Max Base Attributes	Hypercarries Only

The Level 60 Threshold

The transition from Level 1 to 60 represents the most efficient Sanity investment in the game. At Elite 3 promotion, operators unlock:

Gold (T4) Gear Equipment — Set bonuses provide massive multipliers that often outweigh raw stats from additional levels
Advanced Skill Nodes — Access to rank 7-9 skill upgrades
Weapon Tuning Tier 4 — Maximum weapon level cap of 80

The Math: Taking a character to Level 60 requires approximately 470 Sanity. The final push from Level 80 to 90 consumes roughly 2,000 Sanity. This final decile accounts for nearly 60% of the total T-Credit and experience cost but yields a base attribute increase of only 14.3%.

When to Stop Leveling

Main DPS Operators: Level 80 is the practical endpoint. Level 90 is only justified for your primary hypercarry when all other resources are exhausted.

Support and Utility Operators: Can remain at Level 60 or 80 indefinitely without compromising team performance in the majority of endgame content. Their value comes from skill effects and buffs, not base ATK scaling.

Skill Rank Optimization and Mastery Economics

Skills constitute the operational engine of combat in Endfield. Progression in this sector is bifurcated into standard leveling (Ranks 1-9) and Mastery advancement (Ranks 10-12).

Standard Leveling (Ranks 1-9)

Standard leveling utilizes Protoprisms and Protohedrons, which are readily farmable but become increasingly expensive as the rank increases. These upgrades are vital because they do more than improve damage multipliers:

Cooldown Reduction — Faster rotation cycles
Extended Buff Durations — Higher uptime on team buffs
Improved Resource Generation — Better SP return and Ultimate energy gain
Enhanced Utility Effects — Stronger debuffs, larger AOE, improved crowd control

Mastery Advancement (Ranks 10-12)

The move toward Mastery introduces the most severe bottleneck in the game: the Mark of Perseverance, commonly referred to as “Crowns.” These materials are strictly limited in quantity and cannot be farmed conventionally.

Cost Breakdown for Single Skill 11→12:

3 Crowns (Mark of Perseverance)
50 Protohedrons
65,000 T-Credits
Approximately 1,430 Sanity equivalent

Full Operator Mastery Cost (All 4 Skills):

12 Crowns total
~11,440 Sanity
Approximately 58 days of natural energy regeneration

Damage Gain vs Investment

The estimated damage increase from Rank 9 to Rank 12 is approximately 15-20%. While significant, the investment required to reach this level is often better spent elsewhere.

Opportunity Cost Analysis: The Sanity cost of taking one skill to Rank 12 could instead be used to build an entirely new operator to Level 80 with Rank 9 skills. For supports and tanks, the benefits of Mastery are even more marginal, as many utility-focused skills cap their buff scaling or cooldown reduction at Rank 9 or 10.

Skill Priority Matrix

Skill Category	Priority Level	Rationale	Recommended Rank
Battle Skill	Primary	Highest frequency of use, core utility	9 (12 for DPS)
Ultimate	Secondary	Significant impact on boss phases and burst	9 (12 for DPS)
Combo Skill	Tertiary	Situationally powerful based on team synergy	7-9
Basic Attack	Lowest	Weak scaling, low overall DPS contribution	1-6

Weapon Systems: Tuning, Potentials, and Base Multipliers

The weapon system in Endfield functions as a primary stat floor. Weapons are leveled similarly to operators and must undergo “Tuning” to raise their level caps. This process not only increases the weapon’s base ATK but also unlocks the maximum levels for its three internal stat slots.

Weapon Slot Architecture

Slot 1 - Flat Attribute Boosts:

Influenced by Tuning level
Provides Strength, Agility, Intellect, or Will
Contributes to Attribute Bonus multiplier

Slot 2 - Percentage Modifiers:

Influenced by Tuning level
Provides ATK%, Elemental DMG%, or other percentage bonuses
Scales off base ATK from operator + weapon

Slot 3 - Unique Passive:

Categorized by labels: “Detonate,” “Assault,” “Flow,” etc.
Critical: Maximum level tied to Potentials (duplicates), NOT Tuning
A weapon at max Tuning but zero duplicates will cap its passive at a lower level

Weapon Leveling Efficiency

The efficiency of weapon leveling begins to drop after Level 80.

Cost Analysis:

Level 80 → 90 costs approximately 1,500 Sanity
Provides meaningful base ATK boost
Lower priority than securing a good essence for the weapon

Rarity-Based Recommendations:

Weapon Rarity	Base ATK Value	Potential Impact	Optimal Stopping Point
6-Star (Signature)	Extremely High	Luxury (Hard to acquire dupes)	Level 90 (DPS)
5-Star	High	Significant (Easier to reach P5)	Level 80
4-Star	Moderate	Maximum (Easily maxed)	Level 60

For 6-star signature weapons, which are difficult to duplicate, a single copy at max Tuning is often the intended baseline. The missing passive levels can be partially offset by the essence system.

Mathematical Modeling of Combat and Attribute Scaling

A nuanced understanding of the Endfield damage formula reveals why certain investments are more valuable than others. Damage calculation is multiplicative across several distinct “buckets,” meaning that balancing different sources of damage is more effective than over-stacking a single stat.

The Damage Formula

Total Attack Calculation:

Total Attack = ((Operator Base ATK + Weapon Base ATK) × (1 + ΣATK%)) × Attribute Bonus

Attribute Bonus Calculation:

Attribute Bonus = 1 + (0.005 × Primary Attribute) + (0.002 × Secondary Attribute)

Why Attributes Matter

The formula indicates that Attributes are a separate multiplier applied after all other calculations. Consequently, as an operator accumulates high levels of ATK% from gear set bonuses, additional attribute points become increasingly valuable due to their multiplicative nature.

Example Scenario:

An operator with:

500 Base ATK (Operator + Weapon)
100% ATK% from gear (2.0 multiplier)
200 Primary Attribute (1.0 + 0.005 × 200 = 2.0 Attribute Bonus)

Total Attack = (500 × 2.0) × 2.0 = 2,000 ATK

Increasing Primary Attribute to 250:

Total Attack = (500 × 2.0) × 2.25 = 2,250 ATK (+250 ATK)

Increasing ATK% to 120% instead:

Total Attack = (500 × 2.2) × 2.0 = 2,200 ATK (+200 ATK)

Conclusion: At high ATK% levels, Attribute points provide superior returns. This mechanic makes high-rarity gear and essence rolls for Strength, Agility, Intellect, or Will the most powerful endgame stat gains.

Defense and Resistance Mechanics

Defense:

Currently capped by gear rarity
100 Defense provides 50% damage reduction
Diminishing returns apply as defense increases

Elemental Resistance:

Reduces damage at a rate of 1% per point
Maximum cap of 90%
Highly valuable for specific boss encounters

The Critical Damage Problem

Critical Rate and Critical Damage suffer from severe systemic limitations:

Base Critical Damage is locked at +50%
Almost no ways to scale Crit Damage through gear or common buffs
Makes Critical Rate a dead stat for most of the roster

Exception: Specific operators like Yvonne who have innate crit-scaling passives. For all other operators, raw ATK and Attributes are more reliable for damage output.

The Essence System: Terminal Endgame Resource Sink

The Essence system (often referred to as “beads” or “gems”) represents the final layer of operator optimization and the primary source of RNG-based progression. Essences are slotted into weapons to unlock the remaining levels of weapon skills and provide substantial stat bonuses.

Farming Logic and Engraving Efficiency

Essences are farmed in “Severe Energy Alluvium” zones, which unlock after significant story progression. Each zone features a unique pool of potential drops, requiring players to target specific rifts based on their weapon’s requirements.

Engraving Permits are Mandatory:

These permits allow a player to lock two main attributes and one skill/secondary stat, significantly reducing the pool of potential outcomes.

The Probability Problem:

Even with optimal engraving, the probability of obtaining a “perfect” 3/3 essence (matching the Primary Attribute, Secondary Stat, and Skill Tag of the weapon) is estimated at 3-12% per run.

Strategic Recommendation: Do not rush essence farming until your core team has reached the Level 80/Skill 9 plateau. The Sanity investment in early essence farming is better spent on guaranteed character progression.

The Etching Economy

Once a suitable “Flawless” (Gold) essence is acquired, it must be upgraded through “Etching”. Etching involves consuming other Gold essences to increase the levels of the chosen essence’s stats.

Max-Etched Essence Stats:

+6 to the first two slots (Primary and Secondary)
+3 to the skill slot
Combined with max-tuned and max-potential weapon, allows all weapon skills to reach Level 9

Etching Success Rates

Etching Tier	Success Rate	Coolant Gel Cost	Resource Implication
Level 1 → 2	60%	30	High success, no gel needed
Level 2 → 3	24%	60	Moderate success, manual attempts preferred
Level 3 → 4	10.9%	120	Entry point for diminishing returns
Level 4 → 5	~5%	250	High failure rate, 10 gel per failure
Level 5 → 6	2.7%	450	Statistical anomaly; gel highly recommended

Coolant Gel Strategy

Failed etches grant 10 “Coolant Gel” each, a pity currency that guarantees the next upgrade.

Optimal Gel Usage:

Analysis of the etching curve suggests that while the 5-to-6 jump is the most expensive, using gel at the 3-to-4 or 4-to-5 levels can sometimes be more efficient for overall account progress.

Time Investment: A single maxed essence can take approximately 11 to 22 days of dedicated Sanity expenditure to complete, making it the single most time-intensive investment in the game.

Economic Logistics: The Dijiang and Factory Infrastructure

The Sanity economy is supplemented by the Dijiang ship and its associated factory modules. This system provides a non-sanity-gated source of experience records, T-Credits, and rare minerals.

Production Optimization

A fully upgraded Dijiang with optimized operator assignments can produce enough experience to significantly reduce the farming burden.

Growth Chamber Strategy:

The Growth Chamber allows for the multiplication of rare minerals found in the overworld:

Wulingstone — Found in Wuling City, essential for high-level tuning
Igneosite — Found near the Field Logistics Depot
Other Regional Minerals — Location-specific materials for endgame crafting

Sanity Diversion

Efficiently managing the Dijiang allows a player to divert Sanity away from:

Credit stages
XP stages

And toward:

Skill Up Protocol Spaces
Severe Energy Alluvium (Essence farming)

Rule of Thumb: If your factory can produce it, do not spend Sanity on it.

Final Evaluation: Investment Priorities and Diminishing Returns

The strategic allocation of resources in Arknights: Endfield must prioritize guaranteed gains over RNG-dependent optimization until the terminal endgame is reached.

Optimal Investment Hierarchy

Priority 1: Level 60 / Elite 3 for Core Team

Unlocks Gold gear sets
Provides baseline performance for all endgame content
Cost: ~470 Sanity per operator

Priority 2: Weapon Level 80 / Tuning T4 for Main DPS

Massive boost to base ATK
Scales with all other multipliers
Cost: ~800-1,000 Sanity per weapon

Priority 3: Skill Rank 7 Universal, Rank 9 for Core Skills

Smooth rotations and functional baseline power
Battle Skill and Ultimate prioritized for main DPS
Cost: Variable based on skill materials

Priority 4: Essence Matching (3/3 Perfect Match)

Farm correct essence before upgrading bad ones
Etch to 4/4/2 as practical endpoint
Cost: Highly variable based on RNG

Priority 5: Luxury Maxing (Skill 12, Level 90, Etch 6)

Restricted to single most impactful hypercarry
Only after rest of core team is complete
Cost: Prohibitive for most players

The Diminishing Returns Thresholds

Character Level 80-90:

Cost: 2,000 Sanity
Gain: ~14% base ATK increase
Verdict: Sanity trap for all but primary hypercarry

Skill Mastery 9-12:

Cost: 5,000+ Sanity and rare Crowns
Gain: ~20% damage increase
Verdict: Only for signature skill of main DPS

Essence Etching 5-6:

Success Rate: 2.7%
Cost: 450 Coolant Gel (or ~45 failed attempts)
Verdict: Status symbol, not power spike

The 85% Solution

Investment should focus on the “mid-late” sweet spot:

Level 80 characters
Level 80 weapons
Rank 9 skills
4/4/2 essences

This configuration provides approximately 85-90% of an operator’s maximum potential power at less than 40% of the total resource cost required for a “perfect” build.

Strategic Recommendations

For New Players (Account Level < 40):

Focus on Level 60 for 4 core operators
Skip essence farming until Exploration Level 7
Build factory infrastructure early
Hoard Sanity Syrups

For Mid-Game Players (Account Level 40-60):

Push core DPS to Level 80
Weapon Tuning T4 for main team
Skill Rank 9 for Battle Skill and Ultimate
Begin essence farming with Engraving Permits

For Endgame Players (Account Level 60+):

Selective Level 90 for primary hypercarry only
Essence 4/4/2 for full team, 6/6/3 for main DPS
Mastery 12 for one signature skill
Optimize Dijiang production for sanity diversion

For Whale/Spender Accounts:

Crown allocation is still the bottleneck
Focus on versatile operators for Contingency Contract
Essence duplication for etching materials
Weapon Potentials for passive skill caps

Conclusion: Breadth Over Vertical Investment

Strategic excellence in Endfield is not defined by having one level 90 character, but by having a flexible, well-synergized team of level 80 operators supported by a robust factory infrastructure and intelligent essence management.

By avoiding the resource-intensive traps of the terminal levels, an administrator can maintain a competitive edge and prepare for upcoming challenges like the Umbral Monument without exhausting their operational capacity.

The Golden Rule: Breadth of roster utility is almost always superior to the extreme vertical investment of a single, fully-maxed unit.

Quick Reference Tables

Sanity Investment Summary

Investment	Sanity Cost	Power Gain	Priority
Level 1-60	~470	Massive (Gold Gear)	Critical
Level 60-80	~1,200	Significant	High
Level 80-90	~2,000	Marginal (14%)	Low
Skill 1-9	~800-1,200	High	Critical
Skill 9-12	~2,000+	Moderate (20%)	Luxury
Weapon 1-80	~800-1,000	High	Critical
Weapon 80-90	~1,500	Moderate	Low
Essence 3/3	Variable	Very High	Medium
Etch 4-6	11-22 days	Marginal	Luxury

Operator Type Stopping Points

Operator Type	Level	Skills	Weapon	Essence
Main DPS	80-90	9/9/9/1 (12 for main)	80-90	4/4/2 to 6/6/3
Sub-DPS	80	9/9/7/1	80	4/4/2
Support	60-80	9/7/1/1	60-80	3/3/2
Tank	60-80	9/7/1/1	60	3/3/1

Want deeper dives into specific systems? Check out our Essence Farming 101 guide for detailed engraving strategies and our Weapon Essence Etching Optimization guide for advanced etching mathematics.