Delve into an expanded version of your world.
Overhaul of XP system - this mod brings an expansion to the current XP system. Use XP Essence Extractors to extract the XP Essence you get from killing mobs, to convert it to XP!
Weapons/Tools with abilities - this mod brings an expansion to the weapon trimming! Armor has trimming, but why not tools or weapons? They also have unique abilities with them, but are hard to get!
New Boss and Structure - this mod brings a new boss? Find out where he resides in his structure.
Other expanded vanilla features - from colored redstone lamps, to new foods...
This expanded version of your world is known as...
Expansion Craft.