If there are any matching life forms, the mage will know where they are. This is used by some members to track their protected families. This marking will be passed on to the children, and so on. Sometimes this marking is bound to a special trait. The mark can be read by Life 1.
Different markings have different meanings, and are used to keep track of certain traits.
OED have also found that there exist other markings in several bloodlines, which they have not put there. Some members believe that there must have been other mages doing the same thing as they in the past.