You can join in other players’ guild or you can create a guild yourself. If you want to create a guild yourself, you need an emperium.
The guild level is 1 at first. While guild members donate contribution crystals, the guild prosperity increases and guild member who donated can also get contribution. The prosperity and contribution will double if diamonds are consumed.
Contribution can be used to learn guild skill or buy items in the guild shop. The higher the guild level is,the more items can be bought in the guild shop.
You can get contribution crystals by joining the guild dungeon.
While your guild master has not connected for more than 3 days and your position is sub guild master, you can use an impeachment order to promote yourself as master.