Welcome to your new adventure! Long ago, a new art of magic was discovered, but it was long forgotten. You can rediscover this art form. You too, can become a soul reaper.
Begin your journey by smelting a nether star (it totally should have been called a wither star) in a blast furnace. Combine your new item with the most powerful of blades! (Enchantments now included)
OH, WAIT! In order to collect your own gems, you should have some empty gems. Here, smelt these diamonds from Planet Minecraft.