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The longer you delay, the more the AI cheats.
Added 2 hours 8 minutes ago
Yes, I eventually won on heroic difficulty on a large map with 6 players; this time, it was even very easy. Hafiz with a ballista and chaos magic carries, and 100 gremlins really did a good job at the beginning of the game.
Added 55 minutes ago
By the way, at one time, you could summon elementals as many times as you wanted without killing the previously summoned ones, and then they fixed it.