Leagues are what we usually call Guilds on games.
It can be created by paying 100k, you can also apply to other's Leagues hopping for being accepted.
Leagues gains League exp from its members energy used (1:1) with an maximum of 200 League exp limit for each player every day. There is a global daily limit that is setted on 8k League exp.
Leagues also gains zenny from its members, 1% gained on instances by them are automatically stored on League funds.
Leagues can unlock skills through leveling up its League level and buying the skill with Zenny on the League funds.
Guild Master can activate Guild Raid. This instance can be joined by anyone and you have to kill as many enemies as time remains. You get from there League Raid Coins.
We can interact with Seres NPC to exhange League Raid Coins for Items. Also as a League you can create different items using Zenny on funds.
All members can also apply to daily attendance rewards. Those are available at the moment the members login into the game on the League window first tab. You can claim in pressing the button.
Here is the week attendance rewards:
Also, if 10 or more members apply to get its daily attendance rewards everyone get an extra reward: