Tau was created along with his opposite, Angatupyry, by the supreme god of the Guaraní creation myth, Tupã, and was left with humanity on Earth.
[1] Tau found himself enamored by a woman named Kerana, the daughter of Marangatu, who lived among the Guaraní tribe.
Tau disguised himself as a handsome young man and wooed her for seven days before deciding to kidnap her, but his plot was foiled by Angatupyry, the spirit of goodness.
It is generally assumed that he raped her while keeping her in captivity, although the tale is often told differently because the Guaraní did not have a written language, and some accounts tell of Tau and Kerana being married.
Whichever the case, the product of Tau and Kerana's intercourse was seven children who were cursed by the goddess Arasy and born as monsters.