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...Is the inability to exit the city gates if those gates are blocked by the corpse of a creature an old bug in the game or a feature that won't be fixed by HotA?
In my opinion, it's a feature. It's one of the few things that encourages players to level up water magic for unexpected teleportation of demons/skeletons/giants to the opponent. And Reclaimer isn't a very good solution with such a strong castle defense, because you yourself can't even cast an earthquake if something happens, and if the opponent has ballistics, you'll lose even with 100,500 demons. Although, what am I talking about, who uses Reclaimer in 2018, let's forget about it like a bad dream:D.