"However, some critics believe that Tolkien was, in fact, indebted to Wagner for elements such as the "concept of the Ring as giving the owner mastery of the world ..." Two of the characteristics possessed by the One Ring, its inherent malevolence and corrupting power upon minds and wills, were not present in the mythical sources but have a central role in Wagner's opera.Tolkien also acknowledged several non-Germanic influences or sources for some of his stories and ideas.