Only Apollo becomes fully Olympianized… The Olympian sheds his plant or animal form. This causes loss as well as gain. The Olympian refuses to be an Earth-daimon of snake form.
Harrison argues that Olympianization is a transformative theological process entailing the suppression of chthonic and animal-shaped daimonic forms, involving both gain and irreversible loss.
, Themis: A Study of the Social Origins of Greek Religion, 1912thesis