The fact is that mobs have long been easily squeezed for loots in BTW; with MEA, everything will (hopefully) be different.
Download MEA here
Source code here
Features
All Mobs
Mobs enjoy increased melee attack reach distance when holding a tool.
Mobs' senses are strengthened, with further target distance and more points to check, instead of only doing an eye-to-eye check.
Mobs cannot see entities behind them unless they are very close.
Mobs can see through transparent blocks such as glass, leaves.
Mobs no longer try to watch the closest player.
Zombies
Zombies are able to break certain types of blocks blocking the way to their attack target, determined by their held item.
Zombies have a chance to be able to sense targets through opaque blocks.
Skeletons
Skeletons move faster.
Skeletons have a chance to spawn with a melee weapon instead of a bow.
Skeletons predict their target's position before ranged attacks.
Skeletons try not to get too close to dangerous targets when holding a bow.
Skeletons flee from dangerous targets when their health is low.
Skeletons' max health is decreased from 20 to 16.
Skeletons target villagers.
Skeletons try to break nearby burning torches.
Skeletons have a chance to be able to sense targets through opaque blocks.
Skeletons try to flee from explosions.
Creepers
Creepers' fuse time is decreased from 1.5 seconds to 1 second.
Creepers' explosions spawn at the center of them, instead of the bottom.
Creepers have a chance to instantly explode when interacted with shears.
Creepers explode when damaged by explosions.
Creepers don't immediately stop fusing on sight being blocked.
Creepers have a chance to be able to sense targets through opaque blocks.
Witches
Witches move faster.
Witches predict their target's position before throwing potions.
Witches try not to get too close to dangerous targets.
Witches target villagers.
Witches have a chance to be able to sense targets through opaque blocks.
Witches try to flee from explosions.
Spiders
Cobwebs don't only slow down entities' move speed, but also make players hardly rotate their look direction.
Slimes
One of the slimes that big slimes and medium core slimes split into on death becomes a core slime, whose texture is slightly different from ordinary ones.
Core slimes attract nearby ordinary slimes to approach them, and finally merge into them to become one larger slime.
Silverfish
Infested stones generate in all biomes; the deeper, the more.
When attacked, instead of taking damage, silverfish split into two, each of them with half the health of their mother.
Zombie Pigmen
Zombie pigmen are able to break certain types of blocks blocking the way to their attack target, determined by their held item.
Zombie pigmen get invoked by creatures that are too close to them.
Magma Cubes
Small magma cubes melt into a puddle of lava on death.
Magma cubes regenerate their health when touching lava.
Ghasts
Ghasts have a translucent look.
Arrows and throwable items cannot collide with ghasts, instead fly through them.
Ghasts only take damage from fireballs and magic.
Withers
Withers follow their attack target at a larger distance.
Withers sometimes summon wither skeletons when their health is above half.
Withers sometimes dash toward their attack target when their health is below half.
Endermen
Players' gloom level rapidly increase when starring at an enderman.
Players' gloom level rapidly increase when being too close to an enderman.
Ender Dragons
When hit, instead of disappearing, ender crystals become dried, in this state they cannot heal the ender dragon.
When hit, ender crystals avenge the attacker with a lightning bolt.
Ender crystals try to charge nearby dried crystals, helping them restore vitality.
Players' gloom level rapidly increase when being close to an ender dragon.
Spawners
Spawners curse nearby players with negative potion effects when broken.
Passive Mobs
Villagers and pigs try to flee from explosions.