you downloaded a mod that adds a new unique mob to minecraft because you were bored
some info about the mob for you

HEALTH
500 health

DAMAGE

Easy: 4.5 hearts

Normal: 7 hearts

Hard: 10.5 hearts
(same as a endermans but would attack faster)

FACTS
Harmassed can be tamed or calmed with a poppy similar to giving a iron golem a flower if it spawns placid (rare) and if calm will sit and allow players to trade

4 diamonds=Harassed skull (makes mobs besides other harmassed afraid and would avoid you though skeletons would just be at range more and anything that shoots arrows)

2 gold=helmet with PROTECTION II

2 beef/mutton (optional choice) = any stone tool you want (options will get better the more YOU progress)

they mainly live in caves and you will know if one is its home when you see stone blocks pulled up near the mouth of the cave and places near the entrance to kinda block it off

they are attracted to creepers and if they see or come into context with one the creeper wont blow up but it would try to bring it to its cave for you know what

dislikes

HATES Skeleton's and will shriek before charging and hurting any nearby it
HATES bats