Legend has it Ragnarok was the end of all life on earth, it was also believed that it was the end of the gods. But the truth is only the valkyries and giants died. Odin and his fellow gods went down to earth and created a protective barrier preventing the annihilation of mankind. On the other hand Loki created a barrier of his own to protect him and survive Ragnarok.
After Ragnarok, the King of Midgard gave his daughter as a sign of thanksgiving. Odin accepted the King's humble gift and returned to Valhalla with his fellow gods. Odin was afraid that Loki was building another army to recreate another Ragnarok. So He trained the Child the King gave him, he named her Valerie trained to become a Rwadir. A Rwadir's power was the power of song, any song a Rwadir sings can either attack of defend her or even support an ally.
Loki on the other had no choice but to surrender, he had no more allies since the Ragnarok annihilated them all. So he journeyed to Valhalla, which is fifteen-year journey. So he swallowed his pride and journeyed to Valhalla.