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By the way, out of curiosity, I checked what those basilisks were like.
There were 39 of them, arranged in 7 stacks of 5-6 units each, with one stack containing 6 upgraded units.
I managed to defeat them on the first try, losing only 1 wyvern, 28 gnomes, and pikemen. The layout and day were the same as my opponent's.
The hydra remained completely unharmed – it wasn't even attacked once.