Though I have know knowledge of how to create mods, I still wanted to show off an idea I've had for quite a while. For those who are aware of what Warhammer: Age of Sigmar is, I had a mod idea that could add the Daemons of Chaos and their human followers to Minecraft, where you as the player will be able to choose to protect your world from the Chaos Gods and their forces, or worship them to work your way up into becoming a Daemon Prince, an immensely powerful being forever bound to darkness.
Fighting the Chaos Gods
If you choose to defy the Ruinous Powers, then they will begin sending their armies to attack you and your world, as well as infecting it with a taint called Chaos Corruption. However, the player will have access to a special tree that'll allow them to craft powerful items, weapons, tools and other necessities in dealing with Chaos Warbands, banishing Daemons, and suppressing Chaos Corruption.
Serving the Chaos Gods
If you choose to serve the Chaos Gods, you will have to choose which out of the four you wish to align yourself with; Khorne, the Blood God, Tzeentch, the Changer of Ways, Nurgle, the Plaguefather, and Slaanesh, the Dark Prince. Each Chaos God will grant you with a unique skill tree in crafting powerful items, weapons, tools and other necessities to help you rise from a lowly cultist into a leader of a Chaos Warband, and eventually into a Daemon Prince.
These are the general ideas I have; I do have others, but I didn't list them since I haven't organized them yet. any who, I can't wait to hear what you guys think of this idea!