Animated Chess Pieces

Description
Who didn't love a good game of chess? Any adventurers who had ever come across a set of these deadly constructs, that was who! Animated chess pieces were a staple of most any mastermind wizard or illusionist's dungeon. The first set was created by the infamous Uncle Skeleton who challenged close to 100 adventurers to face his set, crushing (literally) all of them in mortal combat.

And unless the set had been split up or some of the pieces had been destroyed, the chess set almost always came in a group of sixteen pieces: Construct Nature. A chess piece did not require air, food, drink, or sleep.
 * the king
 * the queen
 * two bishops
 * two knights
 * two rooks
 * eight pawns