While Sigurd was still contemplating the fallen monster, Regin joined him, and, fearing lest he might claim part of the gold, plotted to slay him. First, he bade Sigurd cut out the heart of the dragon and roast it for him, a task which the youth obediently performed, but in the course of which he stuck a burnt finger in his mouth to allay the smart. This taste of Fafnir's heart blood then and there conferred upon Sigurd the power to understand the language of some birds near by, which exclaimed that Regin was coming behind him to slay him with his own sword! Enraged at such ingratitude and treachery, Sigurd now slew Regin, and after piling up most of the treasure in a cave,--where it continued to be guarded by the dragon's corpse,--Sigurd rode away, taking with him his sword, the magic helmet, and the ring. Still guided by the birds, Sigurd next rode up a mountain, crowned by a baleful light, which he presently discovered emanated from a fire forming a barrier of flame around a fortress. Setting spurs to his divine steed, Sigurd rode right through these flames, which then flickered and died down, and discovered in the centre of the fortress a mound, whereon lay an apparently lifeless warrior. Using his sword to cut the armor fastenings, Sigurd discovered, beneath this armor, the Valkyr or battle-maiden Brynhild, who, on recovering consciousness, hailed her return to life and light with rapture and warmly thanked her deliverer. Then the two, having fallen in love with each other at first sight, explained to each other who they were; and Sigurd, after relating his own origin and adventures, learned that Brynhild, a Valkyr, having defied Odin by saving a man he had doomed to death, had been condemned to mate with any mortal who claimed her hand. Dreading to become the prey of a coward, Brynhild implored Odin to surround her with a barrier of fire which none save a brave man could cross. Although a goddess, she admits she loves her rescuer, and gladly accepts the magic ring he tenders and promises to be his wife. Then he set the ring on her finger and once, if ne'er again, They kissed and clung together, and their hearts were full and fain. The hero, however, doomed to press on in quest of further adventures, soon left Brynhild in the castle where he had found her, still protected by the barrier of flame, and rode off to Burgundy, the land of the Niblungs. Here reigned Guiki, whose fair daughter Gudrun once dreamt that a falcon, after hovering for some time over her house, nestled in her bosom, which she soon beheld dyed red by its life-blood. Disturbed by this ominous dream, Gudrun visited Brynhild and besought her interpretation, only to learn she would marry a king who would in time be slain by his foes.