Hello Aternos please add the following mod. B3ast-rpg.
Link to mod:https://www.curseforge.com/minecraft/mc-mods/b3ast-rpg
This mod gives the game a lot of monsters, dimensions, armor and bosses.
This has a big impact on your world, like the many monsters you find in the basic world, and if you want to go into one dimension, you need to build the portals.