Silver is one of the most important currencies in the Kingdom. It can be converted into Scientific Tractates by Clan Universities and is also used to kick out unwanted players from a Clan's territory. In addition, Silver can be used to train troops and purchase mercenaries during the "Trade Routes" tournament. Finally, Silver can be used to revive troops. You can read more about this here.

Build and upgrade Mansions in order to produce more of this resource. You can also gather resources on the Kingdom Map or obtain them from Clan gift chests or chests that can be purchased in the game's shop. Finally, players can exchange resources with one another if they have built the Caravan. You can read more about this and other buildings here.