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Alex, have you ever heard the legend of Grendel and Beowulf (I mean the legend, not the map with the same name from Heroes 4)? So, compare the description of Grendel with the description of the Creatures; do you notice any similarities? So, as always, there was a legend first, and then, as always, the developers borrowed the description (and sometimes the name). A similar story happened with the dog-headed creatures, which are now called Gnolls...
