The mod called “Hell Difficulty” increases the damage of all mobs in Minecraft, adds more health points, and enhances the attack/movement/flying speed of some mobs while also giving them new weapon abilities.
List of mobs and their new abilities:
Undead (zombies, skeletons, husks, strays, drowned, etc.): undead now have 40 health points and deal 6 damage. They are no longer afraid of daylight and can attack at any time of day. Wolves no longer attack skeletons, and skeletons do not run away from wolves. Skeletons and strays shoot faster.
Creeper: has 40 health points, the power of its explosions increases several times. In addition, Creeper is no longer afraid of cats and does not run away from them (just like Phantom)
Enderman: has 60 health points and deals 14 damage. Does not take damage from water and rain.
Magma Cube: a large magma cube has 32 health points and deals 12 damage. The medium cube has 8 health points and 8 damage, while the small cube has 2 health points and 4 damage.
Blaze: health points increased to 30. Blazes now spawn entities much faster.
Iron Golem: has 300 health points, and the maximum amount of damage has increased to 42. Movement speed has also increased.
Devastator: with 1000 health. The damage has not increased, but the equipment has changed: now its weapon can cause fire. I think if you stay with it in a cave or Void of Minecraft without fire resistance potion, your chances of survival are slim.
Ender dragon: with 400 health. The damage has increased, but slightly, however, the flight speed has noticeably increased.