The strongest castle in Heroes of Might and Magic IV.

But again, a mage isn't a match for a barbarian in a one-on-one fight! :D :cool:

Okay, let's take a well-developed druid. And what do we see?
First turn.
Druid. Summons phoenixes,
Barbarian kills the druid or deals damage.
Phoenixes destroy the barbarian.
Conclusion: barbarians aren't as strong as mages, and against a large number of barbarian troops, the druid can summon even more, and considering that this doesn't require spending money, plus there are troops from daily troop summoning, and barbarians don't have that.