PigeonFuzz's Storybook adds some very niche but useful items themed around a new resource: Henrium.
Henrium can be found below Y=0, and in singular block veins. When destroyed, it yields Henrium Nuggets, meaning you need to find nine veins to craft a single Henrium Bullion. You can use it to travel back to your spawn no matter how far away, have infinite food, fly, and more. This mod pairs well with other mods that prioritize exploration, since it will be a while before you are able to utilize the items in this mod. It also pairs well on multiplayer worlds, as there are a few items you can use to mess with friends.