 The Prose Edda relates that Loki was once forced by the jötunn Þjazi to lure Iðunn out of Asgard and into a wood , promising her interesting apples . Þjazi , in the form of an eagle , snatches Iðunn from the wood and takes her to his home . Iðunn 's absence causes the gods to grow old and grey , and they realize that Loki is responsible for her disappearance . Loki promises to return her and , in the form of a falcon , finds her alone at Þjazi 's home . He turns her into a nut and takes her back to Asgard . After Þjazi finds that Iðunn is gone , he turns into an eagle and furiously chases after Loki . The gods build a pyre in Asgard and , after a sudden stop by Loki , Þjazi 's feathers catch fire , he falls , and the gods kill him . 
