Just in case it hasn't been reported specifically, using Sculla's Mace almost always sets the enemy's attack to a large negative value, which seems to function as a very small positive value with regards to damage dealt. It may have to do with having multiple damage types, or alternatively it may have to do with having the one damage type, but these are just guesses. But I would say 98-99% of the time Sculla's Mace sets attack to the same large negative value. Shrink cast as a spell seems to work properly. I have not tested the Growth potion with any of my characters to see if it works properly.