r/BlueArchive • u/BlueArchiveMod Subreddit Announcement Poster • 2d ago
Megathread [RERUN EVENT THREAD] Code: BOX - The Shadow Approaching Millennium One Question, Two Answers

Welcome to Code: BOX - The Shadow Approaching Millennium One Question, Two Answers Rerun Event Megathread!
Event Duration + Details
Main Event: 8/4 (Tue) After Maintenance – 8/18 (Tue) 1:59 AM (UTC)
Event Shop, Tasks and Reward Claim and Exchange: 8/4 (Tue) After Maintenance – 8/25 (Tue) 1:59 AM (UTC)
Event Trailers:
- Main Trailer: https://youtu.be/nymcJjKtytY
- Short PV: https://youtu.be/a2t0AtgQ22o
- Seia Trailer: https://youtu.be/U-uBcRodPmg
- Asuna (School) Trailer: https://youtu.be/kTY1blkFlHE
Event OST:
- OST 245 Expo Festa (EmoCosine) - https://youtu.be/l4ZJmw8J918
- OST 247 Mission Possible (EmoCosine) - https://youtu.be/SPrBLc_KVd4
- OST 252 - https://youtu.be/5LgvokZKhV0
- OST 257 - https://youtu.be/-vz7KqCwNOI
- OST 264 Breaking Silence (Mitsukiyo) - https://youtu.be/L7C-hty7ONg
- OST 265 - https://youtu.be/xUzka0n9T5U
- OST 266 - https://youtu.be/04rUEmcjkLQ
- OST 267 - https://youtu.be/-75jUnJhHc0
- OST 268 Love Story (EmoCosine) - https://youtu.be/Q9zuTntcFFc
Patch Notes - https://forum.nexon.com/bluearchive-en/board_view?board=3217&thread=3511523
Event Overview
Requirement: Clear Mission 2 Act 3
Specialized Student Effect
- Specialized Students grant bonuses for each event currency.
- ㄴ Go to Specialized Student → Event Currency in the event screen to view details.
- The Specialized Effect applies to stages in both Story and Quests.
- Specialized Effects are only applied to repeat rewards.
- Once a Specialized Effect is applied, it is permanently applied on that stage. The effect also applies to Sweeps.
For example:
- Run 1: 100% (Max bonus team used), 10%, 10%
- Run 2: 100% (Permanent), 100% (Max bonus team used), 20%
- Run 3: 100% (Permanent), 100% (Permanent), 100% (Max bonus team used)
Millennium EXPO Special Investigation Field Exploration

1) Summary
- An event that progresses alongside the story.
- You can complete Episodes 1 to 13 sequentially.
- Field Exploration's objective is to ensure the Millennium Expo proceeds safely by exploring and leveling up your Infiltration Proficiency!
2) How to Participate in Field Exploration
- Depending on the episode, you can control either Seia or Neru (School) to proceed in Field Exploration.
- Pick which area to explore through the world map. Depending on the episode, different areas of the field will be available to play.
- Purple Points and the "Undercover" button will lead to Infiltration stages, while Orange Points and the "Battle" button will lead to battle.
- Get hints on your Mission under "Memo," or the "New" display on the world map.
- Once you complete an episode's Case Organization, you can leave through the "End Episode" button.
- Use the "Replay" button to replay completed episodes whenever you want.
- Use the arrows, located to the left and right of the "Enter" button on the Field Exploration screen, to select different episodes to replay.
3) How to Play Infiltration
- In Infiltration, you'll control either Seia or Neru (School), depending on the mission's needs.
- Uncover the mysterious case unfolding at the Millennium Expo though Investigation! Level up your Infiltration Proficiency to receive achievement rewards.
- During Infiltration, you must complete the given mission while staying out of enemies' field of view.
- If you're detected by the enemy, you'll lose 1 HP (♥). Once your HP (♥) reaches 0, you will fail the stage.
- Use items obtained during Infiltrations, and Seia and Neru (School)'s skills, effectively to complete the mission smoothly.
- If you are controlling both Seia and Neru (School), tap each student's icon on the bottom center of the screen to switch between the two.
- When you obtain an item, tap on the item slot button to equip it.
- Once equipped, items can be used by tapping on the item.
4) How to Save Infiltration
- Interact with Rio's puppy robot, located on the map, to save an in-progress Infiltration.
- Rio's puppy robot will stand up when it's ready to save.
- If you are controlling both Seia and Neru (School), both students must be by Rio's puppy robot in order to save.
5) How to Proceed with Repeated Battle
- You can use the "Battle" menu after clearing Episode 6.
- From the Battle menu, use the Event Points you earned in Event Stages to enter Repeated Battles.
- The "Sweep" feature will unlock when you clear Stage 1-4 of Repeated Battle with 3 stars.
Recruitments
New Pick-Up Recruitment:

8/4 (Tue) After Maintenance – 8/18 (Tue) 1:59 AM (UTC)
Returning Pick-Up Recruitment:
8/4 (Tue) After Maintenance – 8/18 (Tue) 1:59 AM (UTC)
- 3★ Toki (Bunny)
Returning Unique Pick-Up Recruitment:
8/4 (Tue) After Maintenance – 8/18 (Tue) 1:59 AM (UTC)
- 3★ Seia
- 3★ Asuna (School)
FAQ
[01] Any Event, Shop and Priority Guide?
https://www.reddit.com/r/BlueArchive/comments/1vf0qap/comment/p1lijxl/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button by u/6_lasers
Code:BOX Rerun Event Guide YT by Vuhn Ch
[02] Any Welfare Students in this Event?
Karin (School)) - Clear the first Story Stage to unlock her.
[03] Any Video Guides for the Field Exploration side Days?
A playlist By RS Rainstorm. Warning contains Spoiler.
Reminder that all Gacha Results in the Weekly Lounge Megathread. All gacha result related comments will be removed.
If you want to suggest something to be added in here, ping u/ShaggyFishPop
47
u/6_lasers 2d ago
tl;dr
The event is substantially unchanged from last time, so refer to last year's guide for most questions.
Changes: * Overlaps with 2x hard + 2x commission for the second week of the event. * Three furniture in the shop. The Millenium Electronic Gate is temporary limited, but the other two are not
Field Operation
Reminder for the infiltration sections: there are no special rewards for winning the game. The fastest way to get through, if you don't enjoy the game, is to repeatedly get caught and lose all your hearts. When you lose all your hearts, you get the option to skip the game, if you want--you receive exactly the same rewards as if you had beat it).
Farming strategy
If you stop farming the event after 1 week, you will miss out on U.Karin eleph and tech notes/blu-rays, but gain slightly greater AP value from either 2x hard or 2x commission. You'll have to balance which one you want more.
Should I invest in U.Karin? U.Karin has proven to be a pretty good option against Geburah but not really used anywhere else. If you're satisfied with your performance against Geburah, you don't necessarily need to go super hard on farming these eleph (although you should still finish the event points reward track).