It's a project with Mods for a Minecraft project where a medieval style village will be build. There are many mods in it, it's created for 1.16.5
You can build rockets, become a vampire, do some magic stuff (Botania), build machines with the Create mod, have grappling hooks, new bosses and dimensions. There are also new enchants, wings and waystones (kind of teleportation stones), connected textures for glass and the chisels & bits mod (which makes you have variations for blocks), upgraded netherite, rats, bigger chests and better combat.
That are the mods with features (now), maybe there will be more in the future.