“So, you're wondering why the Astromon League exists?
Hehe, it's not as simple a tournament as you're thinking. The Astromon League brings together all masters across the globe under a single objective. Any sort of discord, whether social or political or otherwise, is solved in the Astromon League. ...the Astromon League is essentially the law of Latecia.
To be named victor of the Astromon League is the greatest honor any master can attain, or indeed anyone in Latecia. The winner also receives prize money from the Astromasters' Association, and a stipend every month...”
— Seira
In the Astromon League, players battle against teams of Astromon created by other players to increase their relative rank and earn rewards. The Astromon League is unlocked after completing the 5th stage of Aria Lake.
Battles[]
Offense Battles[]
Players choose an opponent from a list of ten teams near their current League Points. The list of opponents can be reset by spending 
x10, or for free after waiting 10 minutes. The opponent list will automatically reset if all available opponents are defeated.
Opposing teams in the Astromon League will usually have a hidden Astromon. Hidden Astromons remain hidden from the opponent and do not enter the battle until one of the four initial Astromons is defeated.
Winning a battle will award League Points and League Medals, while losing will subtract League Points. After a certain number of turns, Hyper Mode will activate, increasing the damage dealt by all Astromons by 20% for each turn that passes. A few turns after Hyper Mode activates, the player has the option to manually declare the match a draw.
Defense Battles[]
Defense Battles are matches in which your defense party fends off attacks from other players. Different from your regular party, defense parties are made of five Astromons: four regulars, and one "hidden" Astromon.
You can earn league points for winning a defense battle, but you will lose points if your party is defeated, making it important to place your strongest Astromons on the front lines of defense.
Special Seasons[]
Sometimes, a season with special rules will be held, such as the leader/hidden Astromon starting battle with a full SP gauge, or 3
and below Astromons receiving a stat bonus.
Astomon League Items[]
League Tickets[]
League Tickets are used to play in the Astromon League. 1 ticket is required for each battle, and it refills automatically after 5 hours. (1 ticket every 30 minutes)
League Medals[]
League Medals are a form of currency obtained by winning league battles, and can be used to buy items from the League Shop.
League Divisions[]
There are a total of 9 divisions in the Astromon League: Bronze, Silver, Gold, Platinum, Diamond, Challengers, Masters, Heroes, and Champions. You can move up or down between divisions depending on your league points.
League Points[]
League divisions and rankings are determined based on league points. The number of points you earn from winning a match is determined by the difference in points between you and your opponent, and you can earn twice the points by winning a rematch against a player who defeated you. However, you will lose points when others defeat your defense party, so make sure to form a party that can hold its own. Each time the league ranks reset, players begin again with 500 league points.
Rewards and Rank Resets[]
League ranks will reset each Sunday at 13:00 (UTC+0). Once all the points are tallied, you will receive a weekly bonus based on the division and tier in which you placed.
The Champions League[]
The Champions League is a special Astromon League event held for one week every three weeks. Champions League battles take place in best-of-three matches, requiring three offense and defense teams to participate. Players cannot use more than one Astromon of the same type + element combination in their attack teams, or defense teams. There are also three type + element Astromon combinations that are banned from participating in the Champions League each season.
Unlike in normal Astromon League, players cannot declare a draw after a certain number of turns. Instead, the defending team will automatically be declared the winner after too many turns pass.
Champions League battles are played by spending special League Tickets unique to the Champions League, rather than normal ones. Champions League Tickets regenerate at a rate of one per hour.
Rank Points and League Division are calculated individually between the normal Astromon League and Champions League, and additional Divisions rewards can be earned from placing in both during the same week.
Ranks & Rewards[]
| League | Tier |  League Points
|
League Reward |  League Medals/win
|
|---|---|---|---|---|
 Bronze |
3 | 0+
|
30
|
3
|
| 2 | 400+
|
40
| ||
| 1 | 500+
|
50
| ||
 Silver |
3 | 520+
|
80
|
3
|
| 2 | 540+
|
90
| ||
| 1 | 560+
|
100
| ||
 Gold |
3 | 600+
|
120
|
3
|
| 2 | 620+
|
130
| ||
| 1 | 650+
|
140
| ||
 Platinum |
3 | 700+
|
150
|
4
|
| 2 | 720+
|
160
| ||
| 1 | 750+
|
170
| ||
 Diamond |
3 | 800+
|
200
|
4
|
| 2 | 850+
|
225
| ||
| 1 | 900+
|
250
| ||
 Challengers |
3 | 1000+
|
300
|
4
|
| 2 | 1050+
|
325
| ||
| 1 | 1100+
|
350
| ||
 Masters |
3 | 1200+
|
400
|
5
|
| 2 | 1250+
|
425
| ||
| 1 | 1300+
|
450
| ||
 Heroes |
3 | 1400+
|
800 Holy Gleem soulstones x20 |
5
|
| 2 | 1450+
|
900 Holy Gleem soulstones x30 | ||
| 1 | 1500+
|
1000 Holy Gleem soulstones x50 | ||
 Champions |
- | 1st in the ladder | 1200 
|
?
|
League Medals Shop[]
| Item | Availability | Price | |
|---|---|---|---|
|
Gleem Fire/Water/Wood Gleem (Your Choice) |
1 Per Week | 150
|
|
Mini Gleem Fire/Water/Wood Mini Gleem (Your Choice) |
1 Per Week | 50
|
|
Energy Package x36
|
- | 20
|
|
Triangle Gem Chest 6★ Triangle Gem |
1 Per Week | 60
|
|
Square Gem Chest 6★ Square Gem |
1 Per Week | 60
|
|
Diamond Gem Chest 6★ Diamond Gem |
1 Per Week | 60
|
|
<High> Light/Dark Egg Package <High> Light/Dark Egg x3 |
1 Per Month | 1000
|
|
<Heroic> Secret Egg 5★ Fire/Water/Wood Astromon |
1 Per Month | 2000
|
|
Holy Gleem | 1 Per Month | 4000
|
|
<High> Secret Egg 3-5★ Fire/Water/Wood Astromon |
1 Per Week | 100
|
|
<High> Fiery Egg 3-5★ Fire Astromon |
1 Per Week | 150
|
|
<High> Ocean Egg 3-5★ Water Astromon |
1 Per Week | 150
|
|
<High> Grassy Egg 3-5★ Wood Astromon |
1 Per Week | 150
|