The DangerRPG modification by Mixac1 adds:
- A level system for players, mobs, armor, weapons, and tools.
- New blocks, items, tools, armor and weapons
- A new HUD
There are pleasant surprises in each of the bullet points so be sure to check them out.
The Configuration files should be adjusted to suite your preferred level of difficulty.
Official link: https://mods.curse.com/mc-mods/minecraft/251040-dangerrpg
FAQs and bug tracker information is found in the link above.