Mupy-Mup!
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I replayed, there was a version with two holes in the Castle, and at first, he cast not mass slow, but stone skin, then scatter, and it all went downhill... in general, everything was the same, the tactics were similar, the losses were - 4 nymph kamikazes, and the Ents (who were damaged once by dragons) all resurrected. The main thing is to have a blessing giver.