Lord Vile is an immensely powerful Necromancer and was one of the Three Generals for Mevolent. Lord Vile was also said to be the Death Bringer, the Messiah for the Necromancers, but was stripped of that title after he betrayed the Necromancers to serve under Mevolent. It is revealed in Death Bringer that he is actually Silas consumed by anger and grief by Auron Tenebrae. It's is the evil part of him just as Darquesse is to Valkyrie.