The Protocol Pass is Arknights: Endfield's battle pass with three tracks:

  • Basic Supply: Free for everyone.
  • Originium Supply (Tier 2): Costs 29 Origeometry to unlock. Completing it to level 60 rewards 32 Origeometry, for a net gain of +3.
  • Protocol Customized: Paid with real money (~$10), rewards 8 Origeometry.

Unlocking Originium Supply is highly recommended for F2P players. It provides valuable rewards like a 6-star weapon selector, Sanity potions, and upgrade materials on top of the Origeometry profit.

Key Reminder: Always save the 32 Origeometry (plus any extras) from completing each Originium Supply track. This lets you buy the next pass for free and chain them indefinitely with a small profit each time.

You can easily get your first 29 Origeometry (and much more) completely free through early-game content. Here's how:

Step 1: Progress Main Missions (Biggest Free Source: ~70 Origeometry)

  • Play through the main story missions.
  • The "New Horizons Giveaway EXP" permanent event rewards up to 70 Origeometry from early missions alone (1+ per mission).
  • This alone covers two full passes (29 × 2 = 58). Just claim rewards as you complete chapters.

Pro Tip: Prioritize story over side content to hit 29 fast.

Step 2: Collect and Submit Aurylene (~43 Origeometry + Stamina Boost)

  • Aurylene are white, glowing orbs scattered across maps (e.g., 14 in Valley Pass).
  • Use the map counter to track them.
  • Submit at any TP Point (Teleport Point) for Origeometry rewards.
  • Total: Up to 43 Origeometry from all zones, plus increased max Sanity.

Pro Tip: Clear every zone fully; combine with exploration.

Step 3: Hunt Sub-Energy Alluviums (Bonus Exploration Rewards)

  • Explore maps for Sub-Energy Alluviums (special nodes).
  • Interact to claim Origeometry. Amounts vary but add up quickly in early areas.

Unlock and Complete the Pass

  1. Once you have 29 Origeometry, go to Protocol Pass → Unlock Originium Supply for 29.
  2. Earn XP via story, Sanity spends, weeklies, and events to reach level 60.
  3. Claim 32 Origeometry + other rewards. Save it all for the next pass!

Total F2P Potential

70 (story) + 43 (Aurylene) + extras = Over 120 in early game. Enough for 4 passes with profit.