keystone RELIGION AND BELIEF – A potent object. A keystone is any object believed to hold a residue of a person’s → ehwain. Essentially, this could be any object a person interacts with, but the most potent keystones are objects that belong to the person whose ehwain is needed. The more intimate the object, the more potent the keystone. Keystones may be used in simple conjure or → folken magic spells to bless or curse. They may also be used to read a person’s fortune when the person is not present.