Black Dragons

What is your opinion about this unit?

As a true Necromancer, I have a purely indifferent attitude towards all units, but if we consider the statistics, then black dragons are perhaps one of the strongest units. Their immunity to magic is particularly noteworthy. They are only rivaled by lava dragons, titans, and archangels. I haven't played much with the Tribes of the East, to be honest, and the others didn't impress me:p