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Ghosts are truly nightmarish and, in my opinion, unbalanced, just like in the second game. Luckily, they can be recruited very rarely...
But Nightmares are not nearly as terrifying. However, finally, a powerful Gorgon is available not only to the Swamp!
Fire Elementals are approximately the same, only with a different design. Now, even the "Moon" faction can recruit them.
Sorceresses are very stylish and quite strong ranged units.
Metamorphs... oh, if it weren't for the randomness, they would be truly amazing. But even in this form, they are interesting and original.
Wyverns - I wish there were more such monsters from Russian fairy tales...
Dracolich - with its damage block and ranged attack, it has a chance to deal with even the Azure Dragon, let alone others.
Fanatics - didn't impress me; Snipers are better.
What amused me the most were the Santa Goblins (New Year all year round!) and Warlocks, as well as the Sylvan Centaurs (because of their reproduction method).