56:I[32247,["https://static-beta.curseforge.com/_next/static/chunks/0w~8erh86~bx..js","https://static-beta.curseforge.com/_next/static/chunks/14nfxusaie6k-.js","https://static-beta.curseforge.com/_next/static/chunks/0275aot.cmujh.js","https://static-beta.curseforge.com/_next/static/chunks/0g_n93otw.-pg.js","https://static-beta.curseforge.com/_next/static/chunks/0tkr408lvzhzj.js","https://static-beta.curseforge.com/_next/static/chunks/16vmsqhs6o16i.js","https://static-beta.curseforge.com/_next/static/chunks/104ff0.l1q561.js","https://static-beta.curseforge.com/_next/static/chunks/0-u5w5_kfm-tk.js","https://static-beta.curseforge.com/_next/static/chunks/0g1yuq9t3-god.js","https://static-beta.curseforge.com/_next/static/chunks/02hk4ded7-e91.js","https://static-beta.curseforge.com/_next/static/chunks/0m85~fbjn32v0.js"],"ScrollToTopOnEnter"] 57:I[13800,["https://static-beta.curseforge.com/_next/static/chunks/0w~8erh86~bx..js","https://static-beta.curseforge.com/_next/static/chunks/14nfxusaie6k-.js","https://static-beta.curseforge.com/_next/static/chunks/0275aot.cmujh.js","https://static-beta.curseforge.com/_next/static/chunks/0g_n93otw.-pg.js","https://static-beta.curseforge.com/_next/static/chunks/0tkr408lvzhzj.js","https://static-beta.curseforge.com/_next/static/chunks/16vmsqhs6o16i.js","https://static-beta.curseforge.com/_next/static/chunks/104ff0.l1q561.js","https://static-beta.curseforge.com/_next/static/chunks/0-u5w5_kfm-tk.js","https://static-beta.curseforge.com/_next/static/chunks/0g1yuq9t3-god.js","https://static-beta.curseforge.com/_next/static/chunks/02hk4ded7-e91.js","https://static-beta.curseforge.com/_next/static/chunks/0m85~fbjn32v0.js"],"default"] 58:T4ed,Minecraft Mods on CurseForge - The Home for the Best Minecraft Mods Discover the best Minecraft Mods and Modpacks around. Minecraft is an action-adventure sandbox game where players can build pretty much anything they like, explore their surroundings, craft items, and even engage in combat. MC has one of the biggest modding communities in the world, and on this very page - you'll be able to become a part of it. If you've been looking around some Minecraft forums recently, you probably know that this is the home for all the best Minecraft mods. Here, you'll be able to easily find and download the best Minecraft mods and modpacks around. From mods that change Minecraft's game interface, through mods that optimize its gameplay, or even mods that offer various tools for improved building, combating, or exploration. Browse through the selection of MC mods and modpacks, check out their descriptions and photos, and find out which ones are best for you. Always keep in mind that each and every mod is completely free, so you can try them all until you find your favorite Minecraft mods and modpacks. And of course, the important thing is to have fun with these Minecraft mods - using them to create a personalized game experience that's best for you.59:T53b,

This mod is mainly for modpacks. It allows you to increase the difficulty of the game (stats of monsters spawned) for each player after they hit certain milestones (enter a dimension or kill an enemy). You can add and edit difficulty tiers as you like in the config.

Default config looks like this (may be changed in future updates):

[
{"damage": 1.25, "health": 1.2, "exp": 1.5, "dimensions": ["minecraft:the_nether"], "message": "§6Expert mode entered!"},
{"damage": 1.5, "health": 1.4, "exp": 2.0, "dimensions": ["minecraft:the_end"], "bosses": ["minecraft:wither"], "message": "§cMaster mode entered!"}
]

I think this is quite self-explanatory.
Numbers specified are multipliers - for example, zombies have 20 hp in vanilla, and they will have 20*1.4 = 28 hp as you reach the second difficulty.
All the parameters are optional.

You can manage player difficulties via commands /harder <get/reset> and reload config with /harder <reload>.

The mod is server-side, you don't have

Harder - Staged Difficulty