I like Djinns! Mostly because of Illusion, and of course, because of Ice Bolt! But I would also highlight Vampires, because of their ability to restore health, and as Alex Ghost correctly pointed out, they are indispensable against Black Dragons! Magic won't work here! In general, Vampires are strong in Heroes of Might and Magic IV! They have more damage and health than in Heroes of Might and Magic V! I could have voted for both Djinns and Vampires! But I choose Djinns – they are closer to me.