In 211.M31, Leman Russ vanished after a troubling vision. He entered the Eye of Terror, seeking Lion El'Jonson, his old friend and rival. There are also claims that he was lost while chasing xenos through a Drukhari Webway portal. Some speculate he is still among Mankind, protecting them from Chaos, while others believe he sought a cure for the Emperor from the mythical Tree of Life.