You can put gems in there. You can make gems at Sagecraft Altars, one can be found in the first village in the Monastery. You use shards that you find around the world to make gems. These gems when inserted provide bonuses, elemental protection, extra health etc. Different sockets are filled with different gems eg Armor gems go in the armor socket, utility gems go in utility sockets. --- I'm the craziest of the crazy. I'm Manicorabs!!!!!!!!!!!