Mass Slayer heroes often have the capability to destroy a great number of units in a very short time. In general, the more powerful the mass slaying abilities are, the less damage it will cause, but this also depends entirely on the price and requirements of the heroes. They are feared as they can take out a great number of units very quickly, but they can be lacking in single-target damage. This means that they will often lose to other heroes or elite troops. Well-utilized, they can keep an enemy's CP very low.