Yeitso
Yeitso was born from a woman and a stone in Navajo myth. He was a scaly giant that lived by a lake. His name means “great genius” or “great god.” He could hurl lightning bolts. He was killed by Nayenezgani and Thobadzistshini with the help of Tsohanoai and they took his scalp.
Citations:
Bane, Theresa. Encyclopedia of Beasts and Monsters in Myth, Legend and Folklore. United States, McFarland, Incorporated, Publishers, 2016.
Matthews, Washington. Navaho Legends. United States, American Folk-Lore Society, 1897.