Dark One's Blight, which does the exact opposite (weaken a foe), would seem like a more appropriate mirror.

Also, Durkon's got a bonus to con, medium-sized damage dice, while Redcloak's got a penalty to str and small-sized damage dice. Plus, you know, no shield nor weapon. Even assuming they had the same base stats (they almost certainly did not), Redcloak's at a distinct disadvantage when it comes to melee.