The game comes with 5 difficulty levels:
|normal + creative||2|
|hardcore + creative||3|
Important: The difficulty level is saved in the savegame and cannot be changed later.
You must start a new savegame if you want to change the difficulty midgame.
In Basic Mode you can change the difficulty under Server Settings -> Difficulty.
In Advanced Mode you change the difficulty in ServerConfig.json.
Locate the following line:
Change the 0 to the desired value of the respective difficulty, e.g.:
for the difficulty casual.
Then click on Save in both modes and start the server.