well my idea isnt possible with the current version of the editor...
event:
unit - unit is being attacked
condition:
unit-type of(attacking unit) equal to blademaster
action:
if (damage being taken) greater than (max-damage of (attacking unit)) then do specialeffect - create a specialeffect on (attacking unit) using <youreffect>
but you may do it with the strenght, agility and intelligence and then check out how high his max-damage is!!!! | 
