I'm sorry if this was discussed before, but I cound figure out the right keywords, so i didn't find them
I was thinking about a true,really challenging game mode, that would require extreme care to survive. I't would require adding multiple mobs, and new resources for building the appropriate defense.
Is there any mobs, servers like this? Where you can be safe nowhere, monsters will attack from the air, from below the ground, chase u in the water, figth in the forests, they'll hunt down your lifestock, kill you when you stand in the open. A game that would really be about surviving a harsh land (the enviroment would be dangerous too, poisonus gases, explosions in the mine, wildfires, tzunami, vulcano, severe storms).
The nether woud be way more dangerous, but more rewarding, rare nether ores, epic loot from nether fortresses. (armor and weapon shouldnt be peaked with the diamond material...)
A struggling, harsh world where you wouldn't be able to set up a base farm and surviving enviroment in 1-2 hours.