Sacred clay arrows are used in the Stealing Creation minigame. They are made in the game using sacred clay in a creation kiln. Making the Arrows Requires 1, 20, 40, 60, or 80 Fletching depending on the level of clay(1,2,3,4,5). Arrows are non-obtainable outside the minigame.
Shortly after the release of Stealing Creation, these sacred clay arrows appeared in the Grand Exchange Database. Players could make offers on them, and they cost between 2 and 4 coins each. Searching for "sc_arrows*" on Grand Exchange Database revealed 25 versions of them, five for each class of clay, each showing an amount of arrows between one and five. A short time later, Jagex removed the sacred arrows from the Grand Exchange. Any existing offers were canceled, the cash refunded, and the names of the items were all changed to "null".