New Rails for faster minecarts
Several items are renamed or retextured to fit with the overworld-only theme
Large pockets of Blackstone are uncommon in the deep underground
Quartz can be found as a normal ore
Using the EMI mod, simply look up "101" in your inventory to get started with all the changes and important new items
Ancient Debris can be found replacing End Portals and the "Portal" structure in Ancient Cities