Arknights Endfield Side Content Overview – Challenges, Dungeons, and Repeatable Modes

Side content in Arknights: Endfield revolves around Domains (Rifts), permanent challenge modes like Umbral Monument and Delver of the Cryptic, plus region/outpost tasks and a Weekly Routine system. Together, these give you repeatable combat, puzzle stages, and steady weekly rewards alongside the main story.

Domains (Rifts) and Weekly Combat Dungeons

Domains are the main repeatable “dungeons,” unlocked gradually as you progress the story.​

• Domain types:
  • Operator Rifts – character upgrade/XP materials.
  • Weapon Rifts – weapon and tune materials.
  • Recrisis – boss-style challenge stages.
  • Unstable Areas & Energy Alluvium – special resource and challenge nodes.​
• Difficulty scaling:
  • Each Domain has multiple difficulty levels; higher levels cost more sanity but give better rewards.​
  • Clearing higher difficulty once grants all lower-tier weekly rewards; difficulty 5 gives the maximum points in a single clear.​

These are your primary repeatable “dungeon” runs for character, weapon, and boss materials each week.

Umbral Monument – Permanent Challenge Tower

Umbral Monument is a permanent high-difficulty mode tuned as late-game combat content.​

• Structure:
  • A sequence of stages with Normal and Agony difficulties, each with its own modifiers and scoring.​
• Rewards and permanence:
  • Official notes confirm Umbral Monument is now a permanent mode, with an accompanying time-limited event (Monumental Etching) that grants full Oroberyl rewards for clearing Normal stages during its run.​
• Difficulty expectations:
  • Community testing suggests Agony is built around level 90 teams and has meaningful mechanical modifiers on enemies and play patterns.​

Because it never expires, you can grow into Umbral Monument over time instead of rushing it on a schedule.

Delver of the Cryptic – Puzzle-Based Protocol Stages

Delver of the Cryptic is a permanent puzzle-focused side mode announced for release.​

• Gameplay:
  • A set of Protocol Space stages centered on puzzles rather than pure combat, asking you to manipulate mechanisms, terrain, and AIC tools to clear objectives.​
• Rewards:
  • One-time rewards for finishing each challenge, similar to a puzzle dungeon track.​

This gives non-combat side content and encourages experimenting with environmental mechanics.

Weekly Routine and Side Missions

The Weekly Routine system and a large pool of side quests flesh out repeatable and optional tasks.

• Weekly Routine:
  • A permanent tab in the Event Center with missions that refresh weekly, awarding Oroberyls, Arsenal Tickets, and progression materials for clearing domains, challenges, and other activities.​
• Side quests and regional tasks:
  • A long list of optional missions per region (documented in full walkthroughs) that award resources, exploration progress, and sometimes unlock Area Status and outpost upgrades.

These systems give structure to daily/weekly play beyond just spamming the same dungeon.

How Side Content Fits Your Routine

Community and creator guides suggest a simple loop once story and base are moving:​

• Daily:
  • Clear sanity-efficient Domains/Rifts (operators, weapons, special materials).
  • Work on side quests and exploration to raise Area Status and unlock more content.
• Weekly:
  • Finish Weekly Routine tasks, all key Domain difficulties, and pick away at Umbral Monument and Delver of the Cryptic as your team allows.

Handled this way, Endfield’s side content offers a mix of repeatable dungeons, boss challenges, and puzzle modes, without hard FOMO timers on the biggest endgame systems.