Add "Damage(FLOAT:amount, CHARACTER|ITEM:target, CHARACTER|ITEM:source, DAMAGE_TYPE:damage, [INT:levelscale, CHARACTERSTAT_TYPE:attributescale, INT:skillscale])" to behavior script.
Deals the specified amount of damage to the target from the Source of the specified type. If Levelscale is 0, will use level of Source. If Levelscale is -1, will not scale at all and will use amount directly. If attributescale is not null, will scale with specified attribute. If skillscale is 1, scale with relevant skill.