After totaling the result for the Counter-Attack, check if the hero takes damage. Compare the enemy’s total to the hero’s Defense (including all modifiers). If the enemy’s total is higher, subtract the hero’s Defense from the enemy’s attack and deal that much damage to the hero.
For example, your Defense is 4 and you spend 2 to use the ability ‘Stone Stance,’ granting +2 for Melee Counter-Attacks, totaling 6 . The Minotaur’s total attack is 8 (5 die + 3 modifier): 8 minus 6 equals 2 damage to you.