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It’s hard to say which Castle is stronger; with the right strategy, you can crush anyone with anything (IMHO). I like playing as the Warlock; in all parts, I always choose Elves with Unicorns. It’s a good Castle, atmospheric, with 2 archers, a super-fast (and very beautiful) Phoenix, and Unicorns that blind (and are also beautiful). The Fairies overwhelm with numbers and have no retaliation; honestly, I prefer them to Gnomes, whom I don’t respect (by the time they arrive, others have already dealt with the enemy). And the fact that all the heroes are women isn’t that bad. Long live the matriarchy! :D
The Chaos Dungeon for the Warlock and the Titans for the Mage are good, but you have to build them first