("fortress" Mode) a less adventure mode

ideas:

- pve is not a good solution : players have do make traps to kill mobs... like dwarf fortress

- pillagers and zombies sieges happen in non villagers bases... "they don't let players get out if the player make a open-less base. the ai can't go indoors and they don't despawn"

- evokers don't drop "totems of undying" in "non village raids"

- no structures

- the world barrier is closer to spawn

is like dwarf fortress :P