The stone may have been used as a means of sacrifice or for the use of mock battles between a group of warriors and the victim, who was tied to the stone and given a feathery club while the warriors had sharp swords or clubs.
Not "fan art"? I mean, like, dude, WWI biplanes are marked "fan art", shouldn't everything else be "fan art NOOOO COOMMMEERRCIIIAALL USE (IE: no opensource use either, as opensource allows "commercial use")". Get on it, surely the aztecs will rise from their graves and sue if it's not labled fan art.
Why not call this fanartnoopensourceuseswap.com?