RUTHLESS

Ruthless has plans to add more content than simply changing mob behaviour.
Ruthless overhauls vanilla hostile enemies by giving them new attacks, overhauling their entire statistics and making them just generally way stronger than in vanilla. Some mobs will have brand new things such as effects, items, blocks, and retextures. However this is not the case as of now as it only changes a few of the mobs in the game.

Mobs will sometimes rely on eachother and work together.
Ruthless does not change animals, golems, or bosses. But it WILL modify every "monster" enemy. 

All mobs currently changed:

Zombies

Spoiler

• Zombies now run faster
• Zombies see way, way further than they have before.
• Zombies now spawn with tools way more commonly
• Zombies can use totems
• Zombies can spawn with pickaxes and mine through blocks

Skeletons

Spoiler

• Skeletons now run way faster
• Skeletons see slightly further
• Skeletons now have a chance to spawn with swords
• Skeletons now spawn with naturally enchanted bows

Creepers

Spoiler

• Creepers now sprint around
• Creepers can release gas which gives you the Dazed effect

Spiders

Spoiler

• Spiders now scutter extremely fast
• Spiders now automatically make mobs ride them
• Spiders strafe more commonly

Endermen

Spoiler

• Endermen sometimes teleport you a couple blocks up on attack

Phantoms

Spoiler

• Phantoms kidnap players and take them into the sky

Witches

Spoiler

• Witches will chase players 

Most changes can be changed in configs so consider getting a config mod where you can turn them off in-game!

MOD IS IN ALPHA, EXPECT IT TO BE BUGGY