Nerf and modify the trades of the villagers, so that their best trades are not easily farmable.
Metallics Arts Mod: Allomancy, Feruchemy and Hemalurgy, based on Brandon Sanderson's Mistborn series. In the universe of Cosmere.
Simple resourcepacks which adds some symbols to use in ranks on characters that are not usually used.
A simple mod to add account management with /login and /register commands.
Make the piglins and pillagers attack you directly. Who goes around with an unloaded crossbow? Any mob that uses a crossbow will just shoot you.
A simple mod that implements the breaths mechanics based on Brandon Sanderson's book: Warbreaker
