Мугайс
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Right, and the images are plagiarism too :) That's where you got this from :) The first one looks like a beetle robot from HL1 that was shown at the beginning of the game. The Invention has a very distinct style of a legionnaire from Early Rome - red cloak, gladius. Similar armor, just gilded...
I simply found suitable images to make it clearer what I meant. And I have no idea what HL1 is :) As for AD&D, you'd have to be incredibly brilliant not to accidentally repeat something that was in it. The number of books with additional monsters, artifacts, and races for AD&D is in the dozens. You'd either have to be a genius or very lucky not to accidentally repeat something.
But I try not to repeat what has already been in Heroes ;) And if I do repeat, then only the most successful or inevitable parts.