As a god of the wind, the people invoked him to give good wind to the sails of the boats. It was he who was the personification of the cold northern winds; he was the breath of life - the vital principle of all living things. His bones were thought to be clouds. He was also called to 'lift up' the spirits of the dead so that they might rise up to the heavens, known as the 'light land', reached by means of a giant 'ladder' that Shu was thought to hold up.
He was the son of the creator god, father of the twin sky and the earth deities and the one who held the sky off of the earth. He was one of the gods who protected Ra on his journey through the underworld, using magic spells to ward off Ra's enemy, the snake-demon Apep.