Ori and the Blind Forest

From the introduction: A great storm rages one night in the land of Nibel. The great Spirit Tree clings to the shining leaves on his branches when one is wrenched away, whipped about in the wind, and blown far away where it is found by Naru, a kindly being of darkness. The leaf transforms where it lies into a Spirit Guardian, a creature of light and potential power, whom Naru adopts happily.