Magician Adventure

This modpack includes mods like Eidolon, Enigmatic Legacy, and tons of other mods focused on magic items to let you gain all kinds of buffs and abilities.

Exploring the world will lead to all types of new structures, magic-themed biomes, and boss fights. 

You can use the artifacts, relics, and magic items you find around the world to become strong enough to fight all the dungeons and bosses you'll find.

It's also very open-ended, so even if you don't want to play as a "magician", you can use the relics and artifacts in different ways for any playstyle you want, really.