The Freljord is an unforgiving place, a mountainous land covered in snow and ice. Travel, especially in the winter, can be very dangerous. The elements often claim even those who have spent their entire lives there. The boy known as Nunu is one of those who fell prey to such tragedy.
One day when he was a young child, Nunu rode on his father’s back as they returned from a trapping expedition in the mountains. An unexpected blizzard came upon them, forcing them to seek refuge in a cave. The tempest lasted for days. Nunu's father had to leave to find food, but never returned. Eventually the blizzard cleared and the young child lay dying on the mountainside.
Fortunately, this was the land of the yetis, powerful beasts with whom Nunu’s father had secured an arrangement for safe passage. A young yeti boy named Willump found Nunu and brought him home. From then on, Nunu was raised by the yetis. When the League of Legends was formed, the yetis knew they needed a champion. Riding his brother Willump, Nunu became that champion.