OPTIFINE IS REQUIRED!
I would also like to state that to enter and exit combat mode, press 'r' on your keyboard.
Let's be honest, Minecraft is a particularly BORING game. There are NO epic boss fights, no cool terrain, tasks, and ambience at all. Well, if that is is exactly what you are looking for; look no further, for Epic Adventures covers that all for you.
Epic Adventures adds an absurd amount of biomes for you to explore and complete tasks in. You can face of some terrifying foes or make a beautiful house with some modded blocks! There is truly no limit to what you can do on your journey!
Enjoy your adventure in a land of magic!
But the big question is.... what way will you play?
Also, I recommend you use 'Ender Dragon Boss Music' by marcobsidiandev: https://www.curseforge.com/minecraft/texture-packs/custom-boss-theme-the-ender-dragon (Click 'Download' instead of 'Install with CurseForge App' and put it in your Resource Pack folder. Also for this pack to work you need music turned up in the sounds tab.
Also yet another reminder (sorry). You can safely ignore the 1 or 2 warnings at the start.