A melee attacker with relatively low health and 20% chance to perform a Critical Hit. The chance for a Critical Hit doesn't matter too much due to her pathetic damage and Single Target.
Pretty much any attacker can outrange this enemy, so it shouldn't be too much to deal with. Even those units who can't outrange her can just brush the low damage off or avoid it entirely because of her Single Target. Just don't bring any Metal Cats as they will die from the Critical Hit.