Memoir of the Ark Protection Bureau Chief Event
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S1: Forbidden Catalyst | The Great Rift
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☆ New Characters: Chizuru | Itsuku
✪ Upcoming Characters: Sereniel
Tier Lists Pages: Character | Partner | Cards
Memoir of the Ark Protection Bureau Chief is a mission based event to unlock Sereniel's secrets in Chaos Zero Nightmare (CZN). Check out how the event works, the rewards, its release date, and duration here!
List of Contents
Memoir of the Ark Protection Bureau Chief Event Mechanics and Rewards
Complete Missions to Unlock Hunter Combatant and Partner Materials
| Day | Mission | Reward |
|---|---|---|
| 1 | Log in / Level up a Combatant / Level up a Partner |
 Crystals
x60 Advanced Hunter Manual
x15 Advanced Hunter Certificate
x15
|
| 2 | Go on an Excursion / Make a purchase at the Garden Cafe / Proceed with a battle |
 Great Growth Stone of Instinct
x25 B-Grade Policy Report
x3 Crystals
x60
|
| 3 | Proceed with a Policy / Use Policy Points / Use Aether |
Advanced Hunter Manual
x25 Advanced Hunter Certificate
x25 Crystals
x60
|
| 4 | Dine at the Starshine Diner / Use Units / Clear Chaos |
 Unit
x100,000 Premium Growth Stone of Instinct
x15 Crystals
x60
|
| 5 | Conduct Counseling at the Epione Center / Send a present / Proceed with a battle |
Premium Growth Stone of Instinct
x20 Prism Lens
x1 Crystals
x60
|
| 6 | Dismantle a Memory Fragment / Craft a Memory Fragment / Upgrade a Memory Fragment |
 Traces of Memory
x100 Core of Memory
x10 Crystals
x60
|
| 7 | Proceed with a Simulation / Defeat a monster / Proceed with a battle |
Traces of Memory
x100 Core of Memory
x10 Crystals
x120
|
Throughout the event you will complete a series of missions to obtain valuable materials such as Crystals or Hunter Combatant and Partner growth materials that will help you raise Sereniel's level and potentials much faster alongside unlocking secrets about her.
Memoir of the Ark Protection Bureau Chief Release Date and Duration
December 24, 2025 to January 14, 2026
| Start Date | December 24, 2025 06:00 (UTC) |
|---|---|
| End Date | January 14, 2026 01:00 (UTC) |
The Memoir of the Ark Protection Bureau Chief event will start on December 24, 2025 until January 14, 2026 alongside the release of the 3rd phase of the Forbidden Catalyst.
Chaos Zero Nightmare (CZN) Related Guides
| Events and Game Info | ||
|---|---|---|
| List of Events | Bugs and Errors | Patch Notes |
Upcoming Events
| Memoir of the Ark Protection Bureau Chief Event | Toward the First Light Event |
| Overdrive Event | Garden Cafe's Returnee Present Event |
| Hello, 2026! Event | Rei's Gift Event |
Current Events
| Special Exploration Reward - Laboratory 0 Event | See You on the Unigram Event |
Past Events
| Guardian of the Ark Event | SS Nightmare Verification Event |
| Launch Celebration Follow and RP Event | Launch Celebration Comment Event |
| Haru Trauma Code Event | Special Daily Attendance Rewards Event |
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