The paraphrases in Vellekla are of great mythological importance. While other mythic records relate that Thjasse carried away Idun, the goddess of vegetation, the goddess who controls the regenerating forces in nature, and that he thus assisted in bringing about the great winter of antiquity, we learn from Vellekla that it was he who directly, and by separate magic acts, produced this winter, and that he, accordingly, acted the same part in this respect as Rogner and Regin do in Forspjallsljod.
Thus, for example, the poem on Hakon Jarl, when the latter fought against the sons of Gunhild, says: _Hjörs brak-Rögnir skók bogna hagl or Hlakkar seglum_, "the Rogner of the sword-din shook the hail of the bows from the sails of the valkyrie." The mythic kernel of the paraphrase is: _Rögnir skók hagl ur seglum_, "Rogner shook hails from the sails." The idea is still to be found in the sagas that men endowed with magic powers could produce a hailstorm by shaking napkins or bags, filling the air with ashes, or by untying knots. And in Christian records it is particularly stated of Hakon Jarl that he held in honour two mythic beings--Thorgerd and Irpa--who, when requested, could produce storms, rain, and hail. No doubt this tradition is connected with Hakon's supposed descent from Thjasse, the cause of hailstorms and of the fimbul-winter. By making Rogner the "Rogner of the sword-din," and the hail sent by him "the hail of the bows," and the sails or napkins shook by him "the sails of the valkyrie"--that is to say, the shields--the skald makes the mythological kernel pointed out develop into figures applicable to the warrior to the battle.
In other paraphrases Vellekla says that the descendant of Thjasse, Hakon, made "the death-cold sword-storm grow against the life of udal men in Odin's storm," and that he was "an elf of the earth of the wood-land" coming from the north, who, with "murder-frost," received the warriors of the south (Emperor Otto's army) at Dannevirke. Upon the whole Vellekla chooses the figures used in describing the achievements of Hakon from the domain of cold and storm, and there can be no doubt that it does so in imitation of the Thjasse-myth.
In another poem to Hakon Jarl, of which poem there is only a fragment extant, the skald Einar speaks of Hakon's generosity, and says: _Verk Rögnis mer hogna_, "Rogner's works please me." We know that Hakon Jarl once gave Einar two gilt silver goblets, to which belonged two scales in the form of statuettes, the one of gold, the other of silver, which scales were thought to possess magic qualities, and that Hakon on another occasion gave him an exceedingly precious engraved shield, inlaid between the engraved parts with gold and studded with precious stones. It was customary for the skalds to make songs on such gifts. It follows, therefore, that the "works of Rogner," with which Einar says he was pleased, are the presents which Hakon, the supposed descendant of Rogner-Thjasse, gave him; and I find this interpretation the more necessary for the reason that we have already found several unanimous evidences of Thjasse's position in the mythology as an artist of the olden time.