The present article studies the elements of tradition and modernity in canto II in the epic Arauco domado by Pedro de Ona, published in Lima in 1596. His chant II depicts a series of rites and magical practices of the Mapuche world through which seeks to know the future of the Arauco war: an observation to the astral sky (stars and planets) and a later invocation to the Devil. I present the main literary models that Pedro de Ona uses to construct these passages, as well as his novel ethnographic aspects that allow him to update and modify the poetic tradition of the West.