This is the modpack Projekt Xurseiri.
You spawn in a normal world.
You can initially explore these like in Vanila. But then the first mods follow which you can bring in and benefit from them.
This is how you become the "best"
It is based on technology. In some cases, however, there are also other mods.
A minimum of 8GB Ram is recommended for a smooth gaming experience.
The Projekt Xurseiri Team
