Which race would you add to Heroes?

Hey everyone, let's brainstorm about what neutral creatures you'd like to see added to Heroes 5. Ideally, please include not just the names, but also their abilities! =) What do you think, should we add extremely powerful creatures like azure dragons, as was the case in Heroes 3? Even though some creatures and heroes had a few fatal abilities (like Death Harbingers or Pit Lords, as well as various deadly spells), it's generally possible to negate the destruction of the enemy with such abilities. Of course, you wouldn't be able to hire them anywhere. =) And if you could, it would be for an exorbitant price.