Vigilant Tolan is a member of the Vigilants of Stendarr.
He is initially met inside Fort Dawnguard talking to Isran about the recent vampire attacks. He offers to meet the Dragonborn at Dimhollow Crypt during the Awakening quest, but doesn't follow them there. Once the Dragonborn arrives, they will find him dead inside, having been killed by the vampires, but not before taking some of them down with him.
- Vigilant Tolan was originally intended to meet the player after finding Serana, as indicated by unused dialogue options where he meets Serana at the end of Awakening, when viewed through the console.