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This Modpack adds the following and some more :) :

Dungeons:

New Dungeons with stronger Mobs inside due to mods like Dungeon Crawl or Immersive Structures.

New Bosses:

A lot of more challenging bosses via Bosses of Mass Destruction, Cataclysm and many more.

World-Gen Overhaul:

New and improved World generation with Oh the Biomes you'll go and Regions Unexplored

New Machines:

We also have the Create Mod and some addons for it, so you can make some cool machines to shorten the time you need to grind for resources and make your life easier.

Better Storage:

The Modpack also provides better Storage through mods like sophisticated Backpack, Create or Iron Storage.

Better Scaling:

If you get stronger, so should the Enemies and thats why it includes the level up Mod, which increases the Mob level, the farther you go away from spawn (Max lvl 250 => configurable).