Malder
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in the very first versions, like 1.0, this ability was only available to the Necropolis.
And in general, it was much more interesting back then, as each faction had its own unique abilities. And later, they just added them to everyone.
Прячься,скрывайся,наблюдай,слушай,запоминай - и нанеси удар когда его меньше всего ожидают