Folstag is a frost giant notorious throughout Midgard as a raider and pillager. In Fall of the Trident, Skult tricks Arkantos into showing the flag of Folstag to the Norse clans, claiming that they will rally under it. Upon seeing the flag, however, the Norsemen become enraged and attack Arkantos and his men. It is later revealed to them why. In The New Atlantis, Folstag offers the aid of himself and his fellow frost giants to Kastor in fighting the legendary Titan who has emerged in the Norselands as a result of the gods' hold on the gates of Tartarus having been unintentionally weakened. Folstag can freeze any unit with his breath, including Titans.