Stone is one of the main resources in which you use to keep your settlement growing. The main use of stone is to construct buildings and Wonders. Stone can be obtained by constructing a Quarry or a Stone Mason within your settlement. Additionally, it can be recieved as a trade from other players, or another one of your settlements by using a Customs house. You may also recieve 100 stone from the random resources each one of your wonders create daily and some tasks offer stone as a reward as well. It becomes obsolete in the Industrial Age.