ENCLOSED: CHALLENGE

You start in a restricted 7x7 area. The border will expand dynamically based on your XP level. And shrink by 20% when you died.
World border will be desabled soon as you enter to the nether.
You earn XP by killing mobs, crafting and smelting stuff, and mining ores and sleeping.
Some zombies can breack some blocks (glass, glass_panes, fence_gates,, wooden_doors, cobblestone,)
Lunar events will happen randomly at night. Like Blood moon, Miner moon etc...
Lot of dungeons and caves and danger to explore.
Randomly Herobrine will appear around you, he can possess other mobs that make them stronger or Herobrine may just watching you and sometimes build something for you. But soon or later you will have to defeat herobrine.

Tips: if you find wither rose (creepers can drop it when they explose) you can right click on dirt (not grass) this will make cursed dirt wich will make hostile mobs spawning faster on it. you can use it to do mob spawner.

Press "K" ingame to level up your skills.
Possessed mobs are much stronger.
You can eat cooked silk worms.
you can tweack this mod pack as you wich.
Just click on mod in option menu.
you will see all the mods and you can tweack them.

Here few interestings mods:
Enclosed: you can set default world border size. Size increment when you take XP level, penalty ratio is how much border will shrink on death.

Large ores deposit (adlods):  you can set ores generation you can générate more and larger vein (must be set before world gen)

Difficult cave: This is a simple mod that makes hostile mobs stronger the deeper you go.

Improuved mob: This mod increase a lot the difficulty so maybe tweack this one if you want a less difficult gameplay.

Tough as Nails: this is the mod who add thirst and temperature I desabled temperature but you can enable it in config.

Feel free to comment / report bugs / suggestions.