Time marches on for most, but not Gnar. A yordle born millennia ago, Gnar was captured and trapped in true ice, frozen - quite literally - in time. Civilizations formed and fell as the prehistoric yordle vacantly stared on, but nothing – not even true ice – could confine Gnar forever. After breaking free, he wandered Runeterra until he found himself taken in by his yordle descendants. But, as they would soon discover, there’s a beast behind the boy.
Read more here: http://www.pcgamer.com/2014/07/28/league-of-legends-teases-gnar-a-new-champion-with-very-big-teeth/