Again and again Iya fought with Wakinyan. The clouds swirled to the ground, the lightning flashed, the thunder rolled, and Iya roared with a mighty voice. But because Inyan was the parent of both, neither could destroy the other. But Iya was always defeated and driven back to his mother's domain. He still continues to fight and during the fierce battles growing things are broken, uprooted, and smashed. The two mighty giants trample and destroy even the largest trees of the forest, all except the cedar tree, which Wakinyan cannot harm and which Ibom will not harm because under its branches is a safe refuge. Thus began a never-ending strife which is waged between Wakinyan and Iya as Ibom

Lakota Myth, p. 219