A-H.A Occupation Battle

* Logo
* Banner
* PV

### Event Currency(s)

Multidimensional Operation Circuit⁠Dimensional Machine Parts⁠Space Chocolate Burger ⁠Gate Unlock Code⁠

### Event Music

* **Theme 149**
* **Theme 150**
* **Theme 157**

**A-H.A Occupation Battle** (A-H.A占領戦, ***A-H.A Occupation Battle***) is the 2nd Conquest Battle and the second part of a 3-part event that coincides with Main Story Final Chapter. It serves as a continuation of F.SCT Strategic Battle. This is the 21st event and is considered as part of the usual main event in *Blue Archive*.

## Blurb

Rin Ark Uniform Portrait⁠

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## Event Details

### Information

Event 21 - Guide 1⁠

* **Event Period:** February 22nd, 2023.After MT (11:00) JST ~ March 08th, 2023 11:00 JST
* **Rewards Period:** February 22nd, 2023. After MT JST (11:00) ~ March 15th, 2023 11:00 JST
* **Challenge Stage:** February 23rd, 2023 04:00 JST.
* **In this Event:**
	+ There are no Event currency boost.
	+ There are no Strategy Map
	+ The entire event takes place in Conquest Battle.

### Event Tips

* Stages are likely required to be cleared twice. If teachers don't have the upgraded event students; It's easier to clear the stage twice: to get the 3★, bonus student drops, and thus the maximum reward.
* Once an area has been perfectly cleared, at 3★. The stage reward given is always the highest recorded drop, including the bonus from the students.
	+ Using the "Skip or Rush" function will record the highest drop.
* In this event, teachers can farm a lot of items at a very good rate due to an error where it was not intended. As such, there **are** event bonuses for these materials until the matter is fixed.
	+ **Materials (Ooparts)**
	There are **6** types of materials that are obtainable, some ranging from tier 1 to tier 4:
		- **Nebra**Nebra 2⁠ ~ Area 2 (T1/2) / Area 3 (T2/3) / Area 4 (T3/4)
		- **Mystery Stone**Mystery Stone 2⁠ ~ Area 2 (T1/2) / Area 3 (T2/3) / Area 4 (T3/4)
		- **Ether**Ether 2⁠ ~ Area 2 (T1/2) / Area 3 (T2/3) / Area 4 (T3/4)
		- **Wolfsegg**Wolfsegg 3⁠ ~ Area 2 (T1/2) / Area 3 (T2/3) / Area 4 (T3/4)
		- **Voynich**Voynich 3⁠ ~ Area 2 (T1/2) / Area 3 (T2/3) / Area 4 (T3/4)
		- **Crystal Haniwa**Crystal Haniwa 3⁠ ~ Area 2 (T1/2) / Area 3 (T2/3) / Area 4 (T3/4)
	+ **Event Currency**
	Event currencies can drop on all areas and multiple tiles; The information listed below are the areas and battles that have the highest drop. Event currencies can also be boosted by bringing the right student based on the tile. Be sure to check the list of school effects that boost the currencies in each base tile. Click here to check the Areas and Battles.
		- **Multidimensional Operation Circuit**Multidimensional Operation Circuit⁠ ~ Area 4 Battle E
		- **Dimensional Machine Parts**Dimensional Machine Parts⁠ ~ Area 4 Battle L
		- **Space Chocolate Burger**Space Chocolate Burger⁠ ~ Area 4 Battle R
	+ **Equipment Blueprint**
	All **9** types of equipment blueprint that can be obtained ranging from Tier 2 to Tier 5:
		- **All 9 Equipment Pieces** ~ Area 2 (T2/3) / Area 3 (T3/4) / Area 4 (T4/5)

## Conquest Battle

Conquest Battle is a base control game. The goal of conquering titles and occupying. The event features four stages, with each stage getting bigger after the previous one.

### General Information

#### Base Level

Event 21 - Guide 1⁠

All base levels can be upgraded to the maximum of level 3. Each upgrade has a different cost and uses different event currencies depending on the tile and will reward teachers with 2 Divine Fragment⁠ per upgrade.

#### Base Analysis

All Base Analyses can be analyzed by six students. All base has a preference for specific School, only the preferred Student from the School can receive the bonus increase. Depending on the number of students, the event currency drops scale accordingly:

* 2 students ~ 40% increase to Event Currencies **+0 Skill Material**
* 4 students ~ 80% increase to Event Currencies **+0 Skill Material**
* 6 students ~ 120% increase to Event Currencies **+1 Skill Material**

***Note:** These bonuses will also be applied to skill materials (artifacts) due to an error. To get the bonuses, teachers need to form 6 students for the 120% increase to get 1 extra drop.*

To operate a tile, a student must be assigned to each base.

* Teachers can change the assigned student in the operating team up to 20 times a day. (Resets after Server Reset.)
* Assigned students can be still used on a battle, or be allocated/changed to another base.
* Assist function has no fees.

#### Tile

AP is used when conquering all three types of tiles. There are three types of tiles in the Occupied area, consisting of:

* **General Tiles Event 21 - General Tile⁠**
There are no battles when conquering a general tile.
* **Battle Tiles Event 21 - Battle Tile 1⁠** and **Base Tiles Event 21 - Base Tile 0⁠**
Once occupied, base tile can be operated by spending AP. By analyzing tiles, teachers can obtain event currencies Multidimensional Operation Circuit Multidimensional Operation Circuit⁠, Dimensional Machine Parts Dimensional Machine Parts⁠, Space Chocolate Burger Space Chocolate Burger⁠ and other Growth Materials. In Addition, some students from specific schools have bonus buff and drop rates.

#### Battle

Event 21 - Guide 2⁠

There are three systems within the event:

* **Reimbursement Conquest Reimbursement⁠**
Reimbursement will be triggered when 500 AP⁠ is consumed. When Reimbursement Gauge is maxed out, a Conquest Reimbursement⁠ will pop-up on the occupied tiles. The amount of credits given are based on how many tiles are occupied and the level of each Event 21 - Base Tile 1⁠.
* **Hidden Chests Event 21 - Hidden Chest⁠**
Each area has a hidden treasure chests, which contains Pyroxene⁠.

### Mechanics

#### Battle Mechanics

* The assist function can be used up to 3 times a day.
* Forfeiting or in the event, all students get injured, the AP spent is refunded.
* A 3★ of the tile is required to operate the conquered tile.
	+ Clearing the tile with less than 3★, only allows teachers to occupy the adjacent tile, and they cannot be operated.
* Teachers can receive a damage bonus from School/Academy Buff.
	+ Depending on the number of students, the damage scales accordingly:
		- 2 students ~ 50% increase
		- 4 students ~ 100% increase
		- 6 students ~ 150% increase

#### Corruption

* This mechanic will occur on February 23rd, 2023.
* During Corruption, certain tiles occupied by the teachers will be stolen by the enemies.
	+ The Reimbursement amount will decrease as a result.
	+ A -50K Gold⁠ penalty will occur and teachers will not be able to analyze the tile.
* There are 2 types of corruption:
	+ **Small-Scale Corruption**
		- 3 Corruption will occur per day and will reset on 0400 JST.
		- Teachers can click on the "Red Warning Icon" on the top left to check the status of the corruption.
	+ **Large-Scale Corruption**
		- This will occur when teachers spent 4000 AP⁠.
		- Only AP⁠⁠ spent directly in the event will count towards this mechanic.
		- Corruption will corrupt Area 2, Area 3, and Area 4 for the first time.
		- Teachers can click on the "Red Warning Icon" on the middle left to check when the corruption begins.
		- A Red Warning Sign will appear when corrupted.
* To remove a penalty, teachers will need to perform a 'Removal Operation' on the corrupted tile and win using either the "Analyze Team" or the "Combat Team"
	+ **Analyze Team**
	This team will not consume any AP but teachers cannot change the team that was set before Corruption.
		- If the team has "Assist Student", a separate rental fee will be incurred.
	+ **Combat Team**
	This will consume AP and teachers can choose to form a team.
		- If teachers did not set a team during Operation, then this option will be chosen by default.
			* Teachers will be rewarded with 5 Exp Report 1⁠, 3 Exp Report 2⁠, 5 Exp Orb 1⁠, 5 Exp Orb 2⁠, 10 Pyroxene⁠

### Tutorial

**Notes:**

* To start, teachers can only occupy a tile that is adjacent to it.
* A red-dotted border will block any tile that teachers cannot go over.
* Click on the image to enlarge it.

#### Step by Step

1. Assuming teachers start at the very bottom of Area 1, tap on Battle Icon⁠ to battle the enemy.
2. Click on the Operation Icon⁠ to set a team based on the school written in that tile.
3. Farm 500 Multidimensional Operation Circuit⁠.
4. Battle your way through the boss.
5. Exchange Gate Unlock Code⁠ from Multidimensional Operation Circuit⁠ section of the event shop.
6. Unlock Area 2.

#### Quick Explanation

* Tap Battle Icon⁠ to battle, analyze or remove corruption.
* Tap Occupation Icon⁠ to simply analyze.
* Tap Operation Icon⁠ to farm event currencies or skill materials.
	+ Be sure to set up a team based on the school written in each particular tile to receive a bonus.
* Tap Tile Icon⁠ to either checked the tile drops or upgrade the tile to increase the reimbursement credits.
* To clear the area's mission, teachers must occupy all tiles in that area and uncover 3 hidden chests that are random.
	+ Teachers will have to occupy each Event 21 - General Tile⁠ to uncover the Event 21 - Hidden Chest⁠.
* To unlock that next area, teachers need to have 2 things:
	+ Defeat the area's boss.
	+ Obtain the Gate Unlock Code⁠ from each of the 3 different shop.

#### Recommendation

* At the beginning, teachers are recommended not to:
	+ Upgrade any Event 21 - Base Tile 1⁠ until the very end.
	+ Occupy any Event 21 - General Tile⁠ until the very end.
	+ Echange anything from the event shop other than Gate Unlock Code⁠.
* Similar to regular events, teachers should rush to area 4 to do the farming.
	+ Since this event uses AP⁠, teachers can avoid fighting other enemies and go straight to enemies with Conquest Beacon 1⁠.
		- There are also a number of empty Event 21 - General Tile⁠ that teachers can tap on and create a route that head straight for enemies with Conquest Beacon 1⁠.
* Once teachers reach area 4, they can start to farm and do whatever they need.

## Stage Detail

***Note:** To understand the following map, look for the letters in any tile containing an enemy and match that letter to the table below. **Example:** Look for "Battle A" on the tile and match it with "A" on the table".*

* Area 1
* Area 2
* Area 3
* Area 4
* Challenge

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**Battle D / Boss**

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**Battle B**

**Battle C**

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**Battle A**

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**START**

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**Battle J / Leader**

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**Battle K / Boss**

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**Battle L / Leader**

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**Battle H**

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**Battle I**

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**Battle F**

**Battle G**

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**Battle D**

**Battle E**

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**Battle B**

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**Battle C**

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**Battle A**

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**START**

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**Battle P / Leader**

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**Battle Q / Boss**

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**Battle R / Leader**

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**Battle L**

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**Battle M**

**Battle N**

**Battle O**

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**Battle G**

**Battle H**

**Battle I**

**Battle J**

**Battle K**

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**Battle E**

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**Battle F**

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**Battle B**

**Battle C**

**Battle D**

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**Battle A**

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**START**

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**Battle P / Leader**

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**Battle Q / Boss**

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**Battle R / Leader**

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**Battle M**

**Battle N**

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**Battle O**

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**Battle I**

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**Battle J**

**Battle K**

**Battle L**

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**Battle G**

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**Battle H**

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**Battle D**

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**Battle E**

**Battle F**

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**Battle A**

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**Battle B**

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**Battle C**

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**START**

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**Battle D**

**Battle E**

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**Battle C**

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**Battle A**

**Battle B**

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## Achievement

Ayumu Ark Uniform Portrait⁠

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## Shop

### Exchange Shop

Event 21 - Guide 5⁠

Momoka Ark Uniform Portrait⁠

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* Operation Circuit
* Machine Parts
* Space Burger

## Trivia

* A-H.A stands for **Atra-Hasis' Ark**, named after the ship constructed by the protagonist of the Akkadian epic Atrahasis. This ship later served as the basis of other flood myths, such as Utnapishtim's in the Epic of Gilgamesh and Noah's Ark in the bible.
* This is the first event where skill materials (artifacts) get an event bonus.
	+ However, this was not indented due to a notation error in the "Base Analysis" where the event bonus that only applies to the event currencies, unintentionally also applied to the materials. As a result, this error became a feature where teachers can farm bonus materials as long as they have the appropriate student who can boost the bonus.
		- After the fix is applied, teachers will no longer be able to apply the event bonus on materials. However, the appropriate amount that "teachers should obtain under normal circumstances" will be sent to the teacher's mailbox.

## Credits

**V • T • E**1. ↑ Official statement from Blue Archive
2. ↑ Official statement from Blue Archive
3. ↑ Official statement from Blue Archive

## Navigation

 Special Operation
 Spec Ops 01 - Title⁠
 Union Operation
 Event 13 - Title⁠Event 20 - Title⁠Event 22 - Title⁠
 Conquest Battle
 Event 14 - Title⁠Event 21 - Title⁠
 Event 01 - Title⁠Event 02 - Title⁠Event 03 - Title⁠Event 04 - Title⁠Event 05 - Title⁠Event 06 - Title⁠Event 08 - Title⁠Event 10 - Title⁠Event 11 - Title⁠Event 09 - Title⁠Event 12 - Title⁠Event 15 - Title⁠Event 13 - Title⁠Event 14 - Title⁠Event 16 - Title⁠Event 17 - Title⁠