Here is a demo video of the addon:

You must activate the following experimental function!

I’m sure you ever thought that minecraft even on hard difficulty is an easy game, well this addon changes that, now minecraft will be much more complicated!Your goal will be to complete the game with this new difficulty, it is recommended to play on hard to make it more funny!This Addon does not use a resource pack, it is just a behavior pack.As soon as you enter a game in survival you will notice a big difference, then all the changes.

List of upgrades to hostile mobs:

• Now all hostile mobs can spawn in a higher light level, that is, you will need to illuminate your buildings well or the caves you explore, redstone torches, and soulfire will not prevent the spawning of hostile entities.
• All hostile mobs will spawn with stronger armor, and with a higher chance of having enchantments.
• All hostile mobs will attack the villagers!, If you don’t sleep you will notice how they kill the iron golem very quickly.
• Most of the hostile mobs destroy important blocks, such as: chests, beds, doors, and more.
• Now some animals like cows, pigs, chickens, donkeys, mules, horses, camels, among others will defend themselves and attack those who attack them!
• Now all hostile mobs have only a 10% chance to drop their swords/tools or armor pieces.

This addon adds 3 configuration subpackages, they are the following:

Harder Difficulty: 

• To start with something simple, all hostile mobs have a very high vision and tracking range (26 blocks), and can see through walls.
• Hostile mobs spawn rate has been increased, you’ll notice it in an instant, they can spawn in groups of 4 to 10, even entities that didn’t before.

Insane Difficulty:

• To start with something simple, all hostile mobs have a very high vision and tracking range (64 blocks), and can see through walls.
• Hostile mobs spawn rate has been increased, you’ll notice it in an instant, they can spawn in groups of 4 to 20, even entities that didn’t before.
• Skeletons shoot arrows from 22 blocks away!
• Undead entities don’t burn during the day!
• Zombified piglins are aggressive!
• Reduced animal spawn rate by 50%
• Hostile mobs have a mere 40% chance to drop items on death!
• Animals have only a 50% chance to drop items when killed! Also, the player or a pet must kill the animal.

Demon Difficulty:

• Zombies, zombie villager and zombie piglin have higher chance to spawn as babies!
• Enderman are totally aggressive and faster!
• All hostile mobs have a 20% chance to revive on death!
• Hostile mobs have a mere 20% chance to drop items on death!
• Animals have only a 25% chance to drop items when killed! Also, the player or a pet must kill the animal.
• Reduced animal spawn rate by 75%
• Most hostile mobs are now able to climb blocks!
• Zombies can now spawn in broad daylight!
• Some hostile entities may appear with greater speed and strength.
• Enderman can sometimes spawn while invisible.
• Now you must equip a gold chestplate to make the piglins neutral towards the player, If you equip the other pieces it will not work, they will be aggressive.

Changed mobs on all difficulties:

Wither Boss:

• Now summons wither skeletons more frequently, even before being 50% wounded, can also summon normal skeletons.
• Increases the speed of all undead about 64 blocks from him.

EnderDragon:

• Now has 400 health.
• When he is low on life he can summon zombies, skeletons, enderman, tnt and ghast.
• Now he is immune to explosion damage, you can no longer kill him with explosive beds.
• Every so often causes darkness to all non-monster entities for a few seconds.

Ender Pearl:

• Now casting an ender pearl has a 25% chance to spawn up to 4 endermites.

Zombie:

• Their attacks will cause hunger their attackers for 10 seconds.
• Some zombies can spawn with increased speed and strength.

Skeleton:

• They shoot faster, and move faster when locating a target.
• They no longer attack each other if either shoots another skeleton.
• They shoot in large groups.
• Some of them can spawn as wither skeletons.

Wither Skeleton:

• they have 30 hit points now.
• They are slightly faster and 50% recoil resistant.
• Has a chance to spawn with diamond swords, and armor.

Creeper:

• They are faster, they explode faster, and when they explode they place fire.
• Some can spawn being invisible and faster.
• They spawn in groups of up to 6 creepers.

Enderman:

• Spawn in groups of up to 4.
• Nauseate all nearby mobs within 8 blocks of them for 10 seconds.
• When attacking they cause blindness for 10 seconds.
• When hitting one of them, all nearby endermen will be aggressive.

Evoker:

• Evokes his spells faster.
• Now increases the speed of hostile entities near it.

Vindicator:

• When hitting, it causes a bad omen to its target.

Blaze:

• They shoot much faster.

Piglin Brute:

• On hit they cause mine fatigue to their target.

Piglin:

• Slows the target it hits for 10 seconds.

Zombified Piglin:

• Their attacks hunger their target for 20 seconds.
• Poison Effect all non-monster mobs within a 3 block radius for a few seconds.
• If you die at the hands of any of them they will be aggressive with the players for 25 minutes.

Witch:

• They will drop potions much faster, and now they will drink potions more frequently, they can drink invisibility potions when in the rain, they will use regeneration potions when taking damage, and sometimes they will drink slow decay potions.
• They no longer fight each other if any damage potions are accidentally thrown at each other.
• The witch now provides resistance to all nearby monsters.

Ghast:

• They shoot faster, and move away if you’re close to their range.
• Can now spawn in the overworld.

Spider:

• When attacking they nauseate their target.
• If you provoke a spider they attack you in a horde.

Cave Spider:

• Wither Effect all non-monster mobs within a 3 block radius for a few seconds.
• If you provoke a spider they attack you in a horde.

Drowned:

• When attacking they mining fatigue their target.
• Throw tridents faster.

Husk:

• Hunger Effect all non-monster mobs within a 4 block radius for a few seconds.
• When attacking they slowness their target.

Hoglin:

• When attacking they slowness their target.

Zoglin:

• When attacking they poison their target.
• Nauseate Effect all mobs within a 4 block radius for a few seconds.

Phantom:

• When attacking they darkness effect their target.

Endermite:

• When attacking they blindness effect their target.
• Darkness Effect all non-monster mobs within a 5 block radius for a few seconds.

Silverfish:

• When attacking they slow entities.

Ravager:

• Now has 90% knockback resistance.
• Can now break wood.

Slime and Magma Cubes:

They now deal magic damage when attacking, which makes them very dangerous, you can’t block their attacks with a shield, and armor doesn’t reduce damage.

**Installation:**

You must activate the following experimental function!
Beta API
Download and install any of the difficulties, but only activate one at a time!

**Update 1.9:**
*Updated to 1.21.31.
*Now you only need "Beta API" in the experimental features.
*Hostile Mob Spawn increase now works as follows: Harder 100%, Insane 150%, and Demon 200%.
*You can't sleep, the bed will explode if you try!
*Wild wolves are now aggressive towards players at night.
*Now some Wither Skeletons can be archers.
*Now the chance of finding Skeletons, Wither Skeletons, and Boggeds riding a spider is higher!
*Some Zombies can place TNT!