The term 'Lords of the Ring' refers to the characters in J.R.R. Tolkien's fantasy novel, The Lord of the Rings. The crossword solution for this term is REFS, which stands for Ring-bearers. Ring-bearers are the characters in the novel who carry the One Ring, a powerful magical artifact that can control the other Rings of Power. These characters include Frodo Baggins, Samwise Gamgee, and Gandalf the Grey.