Tryndameres Nemesis

Is tryndameres nemesis Aatrox or will it be a new champion? It mentions someone that sounds like it would be Aatrox, but it also mentions a curved living sword. Aatrox's sword is only mentioned as being seemed as living and not actually living so it isn't confirmed in his lore. So it seems like it might be a new champion, or at the very least is yet to be confirmed as Aatrox. If it was a new champion that would be released some time in the future that would also be excellent in possibly filling gaps in the lore such as this.