Magic and bosses

Hi there! :D My idea for Minecraft is to add a magic system where you can give a new use to the cauldron to create magic spells, and also the ability to craft magic weapons (like magic rods). And also add more bosses to the game where they spawn in different biomes, or summon them (like the wither), and make like a boss room for the fight to take place in. And finally maybe make a level up system, for example, the bosses you find in plains and forest biomes are easier because those biomes are common, but a boss in the nether should be harder because it's in a hard place.