Umbral Monument

Endfield's First Permanent Endgame Combat Mode

Last updated: 2026-02-13

Complete guide to Umbral Monument in Arknights: Endfield. Covers unlock requirements, all three stages (Survive the Gas, Unorthodox Tactics, Ballista and Axe), Normal vs Agony modes, recommended team compositions, rewards including Monumental Etching Oroberyls, and common mistakes to avoid.

* TL;DR - Key Points

  • * Released February 12, 2026 -- First permanent high-difficulty endgame mode
  • * Unlock: Complete Paving the Way + Authority Level 30
  • * 4-Operator Teams -- Each stage limits you to 4 operators
  • * Normal & Agony Modes -- Clear Normal to unlock Agony (tacticals banned)
  • * Series System -- Rotating challenges every ~2 weeks
  • * 10-Minute Time Limit -- Defeat all enemies within the timer
  • * 2,250+ Oroberyls available from Monumental Etching event

Community Video Guides

Watch community creators demonstrate Umbral Monument clears, strategies, and team compositions. Videos include F2P-friendly methods, Agony mode clears, and stage-specific tips.

Contents

What is Umbral Monument?

Umbral Monument is Arknights: Endfield's first permanent high-difficulty endgame combat mode, released February 12, 2026. It is designed for players who have completed the main story progression and want challenging content that tests team building and combat execution.

Permanent Mode

Unlike limited-time events, Umbral Monument stays permanently and receives new series updates regularly.

Series System

Each series runs for approximately 2 weeks with unique stages and mechanics. First series: Those Forsaken by the Land (Feb 12-26).

4-Operator Teams

Each battle is limited to 4 operators. Every slot matters -- bring the right tools for each stage's mechanics.

Medal System

Earn Engraved Medals for completing series. Clear Agony mode for trimmed medals -- the ultimate flex.

Pro Tip: Check Enemy Intel

Before starting a stage, check the Enemy Intel button in the stage selection screen. This shows detailed information about enemy types, resistances, and attack patterns -- essential for building the right team.

How to Unlock

1. Complete Paving the Way

Finish the main mission Chapter I Process II: Paving the Way. This is a story progression requirement that ensures you have completed the main campaign before tackling endgame content.

2. Reach Authority Level 30

Earn Operational EXP by spending Sanity, completing missions, and finishing daily tasks. Authority Level 30 represents significant account progression and ensures you have the resources to build competitive teams.

Stage 1: Survive the Gas

Stage Mechanic: Poisonous Mist

The mist continuously deals damage to all operators. Damage increases as you clear waves and stronger enemies appear. When you heal the controlled operator, teammates receive 50% of that healing.

Strategy

  • * Bring a healer -- This is non-negotiable. Ardelia, Gilberta, Ember, or Xaihi are excellent choices.
  • * Stagger Vanguard enemies -- Breaking their shield creates openings for damage.
  • * Avoid armor scales -- Siegeknuckles drop damaging scales on the ground.
  • * Dodge Infiltrator darts -- Successful dodges open counter-attack windows.

Recommended Teams

Laevatain Hypercarry

Laevatain + Wulfgard + Akekuri + Ardelia

Avywenna Premium

Avywenna + Perlica + Gilberta + Ardelia

F2P Friendly

Endministrator + Chen Qianyu + Akekuri + Ardelia

Pro Tip: Healing Echo Mechanic

The healing echo means focusing heals on your active character indirectly heals the whole team. Position your healer's skills to maximize this effect rather than trying to heal everyone individually.

Community Insight: F2P Strategy

Video Source: KyoStinV's F2P Trim Medal Guide

  • -- Ardelia is essential for F2P -- her talent spawns healing ships on the ground that heal on touch
  • -- Build Ardelia with Will stat focus for maximum healing efficiency
  • -- Level 70 works -- you don't need max level to clear
  • -- You have the full 10 minutes -- take your time and prioritize survival over speed for the Trimmed Medal
  • -- For the boss: Go behind him when he does his parry move -- attack from behind to avoid counter

Stage 2: Unorthodox Tactics

Stage Mechanic: Immobile but Scaling ATK

Enemies cannot move, but they are harder to interrupt and continuously gain ATK over time (shown under their HP bars). The longer the fight lasts, the more dangerous they become.

Strategy

  • * Bring burst/AoE damage -- Speed is critical. Do not stall.
  • * Target Nidwyrms first -- Their corrosive spittle leaves damaging puddles that hurt melee characters.
  • * Keep strafing -- Ambushers fire bolts that need to be dodged.
  • * Use Ultimates early -- End the fight before enemy ATK scales too high.

Recommended Teams

Laevatain Hypercarry

Laevatain's Ultimate deletes entire enemy waves instantly.

Avywenna Premium

Strong sustained damage with good AoE coverage.

F2P Friendly

Endministrator + Chen Qianyu + Akekuri + Ardelia

Pro Tip: Watch the ATK Bar

The ATK increase is visible under enemy HP bars. If the bar is filling rapidly, it is time to commit your Ultimate and end the fight. Waiting too long makes enemies hit dangerously hard.

Community Insight: Burst Strategy

Video Source: Mattjestic's F2P Clear Guide

  • -- Save your ultimate for the boss -- Trim regular enemies down to ~10 remaining, then unleash
  • -- Laevatain + Wulfgard + Ardelia core works excellently for consistent clears
  • -- Shield units have been nerfed -- Much easier to break now compared to Beta
  • -- Focus on overhealing and sustain -- Outlast the damage rather than racing DPS

Stage 3: Ballista and Axe

Stage Mechanic: Shared HP Boss Fight

Face two elite enemies: Bonekrusher Executioner (melee) and Bonekrusher Ballista (ranged). When both are on the field, they share the damage they take. This is a survival test, not a DPS race.

Enemy Breakdown

Bonekrusher Executioner

  • -- Spinning melee attacks
  • -- Grab attack (interrupt this)
  • -- Charged axe swings
  • -- Rock throws

Bonekrusher Ballista

  • -- Ranged AoE attacks
  • -- Charged shots (interrupt or dodge)
  • -- Stays at distance
  • -- High burst damage

Phase Breakdown

  1. 1. Executioner spawns -- Sprint out of the opening arrow barrage. Focus on learning his patterns.
  2. 2. Ballista spawns -- After Executioner is "defeated," Ballista appears. Interrupt its charged moves or kite wide.
  3. 3. Both enemies together -- At ~50% HP, both return with shared HP. Executioner chases you while Ballista attacks from range. Survive first, flex later.

Recommended Teams

Laevatain Hypercarry

High burst damage for phases 1 and 2.

Physical Team

Endministrator + Chen Qianyu + Pogranichnik + Ardelia

F2P Friendly

Endministrator + Chen Qianyu + Akekuri + Ardelia

Pro Tip: The Grab is Lethal

The Executioner's grab attack deals massive damage and can one-shot squishy operators. Always keep an interrupt skill ready specifically for this attack. Watch for the grab animation tell and react immediately.

Community Insight: Dodging Tips

Video Source: Samool's Complete Guide

  • -- Lower your graphics settings for Stage 3 -- Makes dodging easier with less visual clutter
  • -- Two bosses throwing projectiles can be overwhelming on high settings, especially for melee DPS
  • -- Group the bosses together when they both jump down to maximize AoE damage
  • -- Gilberta helps group enemies easily with her abilities
  • -- You have 10 minutes for Agony clears -- focus on consistent dodging over speed

Difficulty Modes

Normal Mode

  • -- Tacticals allowed during combat
  • -- Standard enemy difficulty
  • -- Practice stages and learn mechanics
  • -- Required to unlock Agony mode
  • -- Rewards: First-clear items, Engraved Medal

Agony Mode

  • -- Tacticals prohibited
  • -- Significantly harder enemy stats
  • -- Faster ATK scaling in Stage 2
  • -- More aggressive patterns in Stage 3
  • -- Rewards: Trimmed Engraved Medal

Critical Warning: Always practice a stage in Normal mode before attempting Agony. Agony mode requires perfect execution and punishes mistakes severely.

Rewards

First-Clear Rewards (One-Time)

Reward Purpose
Mark of Perseverance Currency for special shop items
T-Creds Standard currency
Advanced Cognitive Carrier Character ascension material
Arms INSP Set Weapon upgrade materials
Protohedron Rare crafting material

Medal Rewards

Engraved Medal

Awarded for completing all stages in a series in Normal mode. Shows you have conquered the current content.

Trimmed Engraved Medal

Upgraded version awarded for completing all stages in Agony mode. The ultimate proof of mastery.

Monumental Etching: Old Wounds Event

Limited-time event running alongside Umbral Monument. Complete challenges to earn 2,250+ Oroberyls.

Challenge Reward
Clear each stage once 150 Oroberyls
Participate in Agony Mode 5 times 150 Oroberyls
Deal 500,000 damage 150 Oroberyls
Deal 1,500,000 damage in Agony 150 Oroberyls
Enter stages multiple times 150 Oroberyls each

Pro Tip: Manual Claim Required

Monumental Etching rewards are NOT automatically claimed. You must visit the event page and manually claim Oroberyls after completing each challenge. Do not forget to collect your rewards!

Team Building Strategy

Essential Roles

1. Main DPS

Your primary damage dealer. Laevatain, Avywenna, or Endministrator.

2. Healer

Mandatory for Stage 1. Ardelia, Gilberta, Xaihi, or Ember.

3. Sub-DPS/Support

Secondary damage or buffs. Wulfgard, Perlica, or Akekuri.

4. Flex Slot

Adapt to stage needs. Defender or second healer.

Elemental Considerations

Heat (Combustion)

Good sustained damage over time. Apply Cryo/Electric/Nature, then Heat.

Electric (Electrification)

Arts DMG Taken debuff. Benefits elemental teams significantly.

Nature (Corrosion)

Resistance reduction. Rare and valuable team-wide buff.

Cryo (Solidification)

Freeze CC + Shatter combo with Physical for massive burst.

Physical Teams

Physical teams (Crush/Breach) are self-sufficient and do not require other elements. They consume Vulnerability stacks for massive burst damage. Pogranichnik is particularly strong for Physical-focused Umbral Monument clears.

Arts Intensity Priority

Arts Intensity scales reaction damage:
-- 100 Arts Intensity = 100% bonus damage to reactions
-- Also improves amplification effects (Electrification, Corrosion, Breach)
-- Diminishing returns past 100 on amplification
-- Characters who apply reactions should prioritize this stat

Common Mistakes & How to Avoid Them

1. Not Bringing a Healer to Stage 1

The gas damage will slowly kill your team without healing. The healing echo mechanic means healing your active character heals the whole team -- take advantage of this. Solution: Always include Ardelia, Gilberta, Xaihi, or Ember in your Stage 1 team.

2. Stalling in Stage 2

Enemies gain ATK rapidly over time. The longer the fight goes, the more dangerous they become. Solution: Use burst damage and end the fight quickly. Do not try to stall or play defensively.

3. Ignoring Boss Attack Patterns in Stage 3

Both Bonekrushers hit hard enough to one-shot operators. Solution: Focus on learning their attack tells and dodging rather than face-tanking. The Executioner's grab is particularly dangerous -- keep an interrupt ready.

4. Using the Same Team for All Stages

Each stage has different mechanics that favor different compositions. Solution: Stage 1 needs healing, Stage 2 needs burst, Stage 3 needs survivability. Adjust your team composition for each stage.

5. Attempting Agony Mode Without Practice

Agony mode bans tacticals and significantly increases difficulty. Solution: Practice the stage in Normal mode first to learn enemy patterns and perfect your execution. Do not waste Agony attempts on blind runs.

6. Forgetting to Claim Event Rewards

Monumental Etching rewards are not automatically claimed and can expire. Solution: Check the event page after every Umbral Monument session and claim your Oroberyls immediately.

Quick Reference Checklist

Frequently Asked Questions

When does Umbral Monument unlock in Arknights: Endfield?

Umbral Monument unlocks after completing Chapter I Process II: Paving the Way and reaching Authority Level 30. This is endgame content designed for players who have finished the main story progression.

What is the difference between Normal and Agony modes?

Normal mode allows the use of tactical consumables during combat and has standard enemy difficulty. Agony mode bans all tacticals and significantly increases enemy stats, ATK scaling speed, and attack aggression. Clear Normal first to unlock Agony.

How do I get Oroberyls from Umbral Monument?

Oroberyls come from the Monumental Etching: Old Wounds event that runs alongside Umbral Monument. Complete specific challenges like clearing stages, dealing damage thresholds, and entering Agony mode. You must manually claim rewards from the event page -- they are not automatic.

What are the best teams for Umbral Monument?

Stage 1 requires a healer due to gas damage. Stage 2 needs burst/AoE damage since enemies gain ATK over time. Stage 3 requires survivability against two powerful elites. Laevatain hypercarry teams excel in all stages. F2P teams with Endministrator, Chen Qianyu, Akekuri, and Ardelia can clear all content.

How long does each Umbral Monument series last?

Each series runs for approximately 2 weeks. The first series 'Those Forsaken by the Land' runs from February 12-26, 2026. The second series 'Inorganic Construct' begins February 26, 2026.

Can I use the same operators for multiple Umbral Monument stages?

Yes, operators are not locked after use. You can use the same team for all stages or swap compositions between stages to adapt to different mechanics. Each stage can be attempted with different teams.

More Community Videos

Additional video guides from the Endfield community. Watch different strategies, team compositions, and stage-specific clears to find what works best for your account.

F2P Trim Medal | Those Forsaken by the Land - Umbral Monument Agony【Arknights: Endfield】
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F2P Trim Medal | Those Forsaken by the Land - Umbral Monument Agony【Arknights: Endfield】

KyoStinV

14,525 views
NEW Umbral Monument 100% FULL AGONY F2P Clear Methods | Step By Step Guide
17:30

NEW Umbral Monument 100% FULL AGONY F2P Clear Methods | Step By Step Guide

Mattjestic MultiGaming

6,692 views
Umbral Monument Is Finally Here! What To Know & All Trimmed/Agony Runs [Arknights: Endfield]
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Umbral Monument Is Finally Here! What To Know & All Trimmed/Agony Runs [Arknights: Endfield]

Samool

6,708 views
P0 Ember (Trimmed Medal) vs Umbral Monument: Those Forsaken by the Land
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P0 Ember (Trimmed Medal) vs Umbral Monument: Those Forsaken by the Land

Lisara

11,891 views
Endfield's first Event Showcase
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Endfield's first Event Showcase

Sciel

6,164 views

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