This mod is simply a standalone port of the commands added by the Mob AI Tweaks mod, as datapack creators are requesting me a separate, server-side only port of them.

Adds the following commands:

/attack - makes one mob attack another, recommended to be used in conjunction with /execute for full control

Examples:

/attack @n[type=husk] fake_melee (make husk use swing animation but not deal any damage)

/attack @n[type=drowned] @n[type=bogged] with_melee (make drowned use melee attack on bogged)

/attack @n[type=skeleton] @p from_range (make skeleton use their default ranged attack, in this case, shooting an arrow, on the nearest player to it)

/attack @n[type=zombie] @r custom_projectile minecraft:arrow 1 20 {crit:1b} (make zombie shoot an arrow at a random entity with speed of 1, inaccuracy of 20 and nbt data of {crit:1b})

/motion - self explanatory, lets you apply velocity to mobs

Examples: 

/motion @p 0 1 0 add (adds 1 to y velocity)

/motion @p 0 1 0 set (sets velocity to 0x, 1y, and 0z)

/motion @p ~ 1 ~ set (set y velocity to 1 but keep x and z motion)

/motion @p 0 ~ 1 set true (set x velocity to 0, keep y velocity, set z velocity to 1 and rotate according to yaw)

/motion @p 0.5 ~ 0.5 multiply (multiply x and z velocities with 0.5)

/pathto - forces mobs to pathfind to a given coordinate or another entity

Examples:

/pathto @n[type=zombie] 0 0 0 (makes zombie pathfind to world spawn)

/pathto @n[type=zombie] ~10 ~ ~ 2.0 (makes zombie pathfind 10 blocks forward in x axis with a speed multiplier of 2.0)

/pathto @n[type=zombie] 0 0 0 2.0 10 (makes zombie pathfind to world spawn with a speed multiplier of 2.0 keeping a minimum distance of 10 blocks away from the destination)

/pathto @n[type=zombie] @p (makes zombies pathfind to the nearest player)

/pathto @n[type=zombie] @p 0.5 (makes zombies pathfind to the nearest player with a speed multiplier of 0.5)

/pathto @n[type=zombie] @p 0.5 4 (makes zombies pathfind to the nearest player with a speed multiplier of 0.5 while keeping a minimum distance of 4 blocks away from them)

/target - makes mobs target each other

Examples:

/target @n[type=blaze] @n[type=breeze] (makes blaze target breeze)

Additionally, this mod backports /rotate from 1.21.2