Which monster do you like the most in Heroes 5 at level 5?

Hydras. Without them, Dungeon wouldn't be what it is. After the last hydra is killed, all of the Warlock's defenses collapse completely and irrevocably, but as long as even one is alive, it keeps enemies at bay... and that gives Assassins and others a chance. Besides, when faced with hydras up close, the enemy suffers significant losses, and the hydras themselves even revive!