This is the main content of CBUNI, where Cosmic Heroes battle each other to collect Cosmos Points.
The Arena has various game modes, all of which save for CHAOS battles are co-op battle modes.
Work together with your teammates to victory!

In the Central Area, Angel Academy, Resort Area, and all Union Areas, Select [ARENA] from the Menu to see all of the available Modes and Rooms.


Generally, when in Arena rooms, players will remain in the Room even the match ends.
To leave a Room, open the Menu and select the [LEAVE] button.




Win matches by reducing the opposing team's Battle Points (BP) to 0 or below.
Also, if the Match exceeds the time limit, the team with the most remaining BP will win.

Battle Points (BP) are the team points that determine the outcome of an Arena match.
At the start of a Match, each team is assigned a number of BP based on the number of players in the team.
During a Match, when a robot is destroyed, BP equal to the robot's Cost will be subtracted from the remaining BP.
In certain stages, large amounts of the enemy's BP can also be consumed by destroying their Power Spots.
Your team's BP will be displayed in blue on the screen, and the enemy team's in red, so keep an eye on the counter while the fight continues.

Players will receive Points each time they destroy an enemy robot or support a teammate.
If a player with a high score is defeated, more BP will be consumed than the Cost of the robot they deployed.
Players with a high Score will have a star displayed above their heads in combat.
Actively target players marked with ★ to make an impact in the battle!


Arena has various Game Modes, including the options below:
・Union Wars
・Union Wars Legion
・Event Battle
・Team Fight
・Clan Fight
・Epoch Battle
Details for each mode can be found below.

In this mode, Union will compete against one another.
Union Wars has a variety of Rooms with Rules.
・SHUFFLE Union Wars
・Rank-Limited Union Wars
・Battle-Rating Restricted Union Wars
・Union Wars [UNION]
・Union Wars [ARK]

A standard battle room where all Union mingle to fight together.
These Rooms come in 15vs15 and 30vs30 varieties.
For both Room types, players will be shuffled into teams before the battle.


These Battle rules are the same as SHUFFLE Union Wars, but with restrictions on the rank of participating players.
This Room is recommended for novice Heroes, as high ranking and experienced players will not be queued with them.


These Battle rules are the same as SHUFFLE Union Wars, but with restrictions on the Battle Rating (Br) of participating players.
Battle Rating changes based on the player's skill, so this Room is ideal for fighting players of a similar capability.
Battle Ratings are divided into three categories: [4 and below], [3~5], and [4 and above].


This number indicates the strength of all Heroes.
Br will change when participating in Battle-Rating Restricted Union Wars and SHUFFLE Union Wars 15vs15.
Br gain will vary depending on the Score obtained during the Match and the average Br of participating players.
One's own Br can be checked in the Garage's PROF page.



・Br will be reset with each new season.
・Br ranges from 10.0 to 1.0.
・Once BR exceeds 6.0, it will not drop below that value for the rest of the season.

When Br is reset, the values will change as follows ( the value on the right will be after the change):

These Rooms are here to help new Heroes get used to combat.
There are two types of rooms: Training Arena and Legion Room.


In this Room, Heores can learn basic character controls and combat methods.
It is accessible from the Union Wars Legion Room.

There are three STEPS, 1-3. Completing STEP 1 will unlock STEPs 2 and 3.
STEP 3 allows you for battle in a simulated Arena, making it the perfect place to try out new units and customize gear.
The Training Arena can be joined at any time, so give it a try if you are unsure of how to operate the game.


This Room allows for more practical battle experience than the Training Room, and is also accessible from Union Wars Legion.
The battle rules are the same as Union Wars, but players can team up with a number of NPC robots to train in combat.
Up to three players from each team can participate in a battle Room, with the remaining 15 vs 15 combatants comprised of NPCs.
NPC robots will be added as allies for a maximum of 15 vs 15 battles.

Union Wars LEGION also has LEGION Orders available.
Orders give gameplay indications, such as [Obtain a score of 2,000 points or more].
Clearing each Order will impart items and parts as rewards.

By clearing multiple Orders, the player's Order Level will increase, allowing for the acceptance of even more difficult Orders.
Increasing the Order Level will require clearing all of the Main Orders and a certain number of Normal Orders as well.

The rewards from LEGION Orders will be useful to new Heroes, so be certain to try to clear them all.
If clearing them proves too difficult, please try again with a tune-ups, leveled-up or otherwise bolstered characters.

Other Heroes may be presnt in the LEGION Room, and they can also participate in matches.
If the player wishes to leisurely fight on their own, it is recommended that they choose an unoccupied Room.

When events are being held, players can participate in Rooms with special Rules.
[Vs?] Rooms have all Unions participate against a giant boss.
Work together with your allies to take down great enemies!
Under Union Wars, there is an Event Battles tab.
These Union Wars have special rules disparate from other Union Wars.
・CHAOS
・Union Wars [UNION]
・Union Wars [ARK]
・Limited Time Event Battle

This mode features Heroes fighting together against the enemy forces of CHAOS.
As all Heroes fight together regardless of Union affiliaion, it is easy to join.

Union Wars is the oldest and most basic of all of the battle modes of the Cosmic Ark.
Members from each Union gather to battle against one another.

These Rooms have the greatest fluctation in Cosmos Points.
Unlike the SHUFFLE Union Wars, in these Union Wars, players fight alongside only members of their own Unions, allowing them to devise strategies.

※Union Wars [UNION] operates at predetermined times.


The rules are basically the same as Union Wars [UNION], but in this Room one person from each team fights as an [Ark].

※Union Wars [ARK] operates at predetermined times.

Team Fight Rooms allow players to freely choose the stages and rules for their match.
The rewards are more modest than in standard Union Wars, but they offer greater control instead.
Players can also fight on custom stages made with the stage editor!


The Stage Editor can be launched with the button on the bottom right of the launcher screen.

In Epoch Battles, elite players of each Union gather together to compete for power in 12 battle areas.
Epoch Battles differ from regular Union Wars in that players are divided into attacking and defending sides.

The Attack team's goal is to destroy the enemy's Power Spot.
The Defense team's goal is to protect their power spot until the enemy BP reaches 0.

The Defence team incurs significantly less Cost when defeated, so they can fight without worrying about Costs moreso than in regular Union Wars.


An announcement will be made before the start of an Epoch Battle.
To join, press the [Epoch Battle Status] button, select the preferred battle area, and join the battle.

Please note that participation in the Epoch Battle is selective, with priority being given to Heroes who have gained lots of Points in the current week's Union Wars

Epoch Battles will occur at set times.


Cosmos Points will be awarded to each Union based on the number of areas they control at the end of the week.
The outcome of Epoch Battles will have a large impact on the Union's weekly ranking, so be sure to bring your best for these matches!

Clan Fight is a mode in which participating Clans are automatically matched to compete in the Arena.
Like Epoch Battles, this is a special battle mode that is only held at specific dates and times.


Winning a Clan Fight imparts the exclusive Clan Coin rewards.
Talk to the Clan Coin Exchange NPC in front of the Clan counter to exchange these Coins for limited parts.

1. Robot Cost is limited to 3000.
2. If the Commando contains any robots with a Cost of 500 or less, it will also not be able to participate in Clan Fight.
3. Teams with a difference in participants of 3 or more will not be matched. If a difference of 3 or more players occurs after matching due to a network disconnection or other legitimate reason, the team with the smaller number of players will be strengthened.
4. Winning a match will earn 2 Clan Coins.
※Clan Coins are only earned by memebers of the Clan that participated in battle.

1.Purchase a Clan Formation Certificate from the Shop for 7,000 UC.
2.Raise your Hero Rank to Iron or above.
3.Go to the Clan Counter in the Union Area.

At the end of each match, awards will be given out based on performance during the match.

Be sure to frequently check your radar using the TAB key during a match.
Knowing the positions of your teammates and enemies is the key to victory.

Enemy aircraft will only appear on your radar when an ally locks onto them.
Be careful of surprise attacks from behind from unnoticed enemies!
Also, using the Custom Cartridge Broad Radar will make all enemy aircraft visible from the start of battle.


・If your weapon's Ammo is running low, try using [Shell Supply].

Another strategy is to allow your robot to be defeated before you run out of ammo.
Being defeated will result in a loss of BP, but the player will be able to switch with another robot in the commando, giving players the advantage of choice.


・For cooperating with allies, it will benefit players to use Radio Messages.
During battle, messages can be sent to team members by pressing the Z, X, and C keys.
The Z key issues commands, for when you want to charge or when you need healing.
The X key codes for report messages, such as reporting when an enemy unit is spotted or when a support unit begins recovery.
The C key is for responses, used to respond to instructions or to express gratitude.

Items can be dropped by pressing the TAB key + [item number]. Drop items you don't need to help give your allies an edge in battle!