Location Function Creator The Seal of Mar is the family crest of the House of Mar, and also serves as an access key in Jak II and Jak 3. The crest resembles a yin-yang sign, although the two components are stacked vertically on top of each other, more closely resembling the number 8. It is found engraved in stone, made of Precursor metal, and as an amulet made of other unknown materials.