The most powerful warrior.

If we're talking about purchased creatures, then the Archangel is the best, and if we're talking about summoned creatures, then the Phoenix is great – it depends on the strength of your magic. I had a hero with 42 magic power, and he could defeat all the monsters with just one Phoenix, dealing 20 damage to Bone Dragons per hit. And Arantir, from the latest expansion, has the ability to summon a Spirit of Death, which looks like a ghostly dragon. That's also powerful, but it's tied to the hero's level, but it's still very effective. With either of those, Azure Dragons are no match!