Aesir VS Thiassi

But the Æsir were badly affected by Idunn’s disappearance and
soon became grey and old. Then the Æsir held a parliament and
asked each other what was the last that was known about Idunn,
and the last that had been seen was that she had gone outside
Asgard with Loki. Then Loki was arrested and brought to the
parliament and he was threatened with death or torture. Being
filled with terror, he said he would go in search of Idunn in
Giantland if Freyia would lend him a falcon shape of hers. And
when he got the falcon shape he flew north to Giantland and
arrived one day at giant Thiassi’s; he was out at sea in a boat, but
Idunn was at home alone. Loki turned her into the form of a nut
and held her in his claws and flew as fast as he could. When Thiassi
got home and found Idunn was not there he got his eagle shape and
flew after Loki and he caused a storm-wind by his flying. And
when the Æsir saw the falcon flying with the nut and where the
eagle was flying, they went out under Asgard and brought there
loads of wood-shavings, and when the falcon flew in over the
fortification, it let itself drop down by the wall of the fortification.
Then the Æsir set fire to the wood-shavings and the eagle was
unable to stop when it missed the falcon. Then the eagle’s feathers
caught fire and his flight was ended. Then the Æsir were close by
and killed giant Thiassi within the As-gates, and this killing is
greatly renowned.

But Skadi, daughter of giant Thiassi, took helmet and mail-coat
and all weapons of war and went to Asgard to avenge her father.
But the Æsir offered her atonement and compensation, the first
item of which was that she was to choose herself a husband out of
the Æsir and choose by the feet and see nothing else of them.


- Prose Edda, Skaldskaparmal