Modpack Pyromancer Adventure by Speshel_

This modpack focuses around the Pyromancer mod, allowing you to play as a Pyromancer and unlock more powerful fire-based gear over time.

You can craft Brimsteel armor and weapons, unlock Pyromancy enchantments for the Blazing Journal, and after defeating the Piglin Legion and Unburned bosses you can unlock Pyromancer artifacts, letting you do all sorts of fire magic.

You'll also find many different structures throughout the world that can make your journey easier with things such as Netherite, trinkets, and all kinds of other stuff.

There are also very powerful end-game bosses from L-Ender's Cataclysm, which will prove to be a major challenge.