Pantheons of deities are not unified among practitioners of Slavic Native Faith. Different Rodnover groups often have a preference for a particular deity over others. Some Rodnover groups espouse the idea that specific Slavic populations are the offspring of different gods; for instance, groups relying upon the tenth-century manuscript "The Lay of Igor's Host" may affirm the idea that Russians are the grandchildren of Dazhbog (the "Giving God", "Day God"). The Union of Russian Rodnover Communities founded and led by Vadim Kazakov recognises a pantheon of over thirty deities emanated by the supreme Rod; these include attested deities from Slavic pre-Christian and folk traditions, Slavicised Hindu deities (such as "Vyshen", i.e. Vishnu, and "Intra", i.e. Indra), Iranian deities (such as Simargl and Khors), deities from the "Book of Veles" (such as Pchelich) and figures from Slavic folk tales such as the wizard Koschei. Rodnovers also worship tutelary deities of specific elements, lands and environments, such as waters, forests and the household. Gods may be subject to functional changes among modern Rodnovers; for instance, the traditional god of livestock and poetry Veles is called upon as the god of literature and communication.