My players says monster suddenly have become almost impossible, and I agree, is there any way too change it??

It would be nice if EHM used ”difficulty=” in server.properties as multiplier to set monsters hit points.

¯\_(ツ)_/¯

If you want to change mob health and the like, using something like MobManager would work. I think you should be able to toggle what sort of effects the mobs apply though... like you could remove the slow the zombies cause.

Thanks for fast respond.
I will have a look at it.

Edit:
Well found the problem, it was not EHM that made zombie stand for 17 hits from diamond sword.
It was ProtocolLib that messed things up...