Edit monsters to 100% hit

In my server when monsters attack player etc they sometimes miss and it shows "block", "defense" etc. How to make a monster always hit without miss. 100% hit.

I tried change monster attack rating to big numbers but it doesn't seem to work.

Anyone know how to make a monster 100% hit always without miss on player?

Yes players need to have 0 def and 0 block :)

Or answer laying in Mystic (mob from ice map), but I am not sure if he can miss when he explode.