Sorin is a vampire lord of Innistrad. His Grandfather is Edgar Markov, the first Vampire. Sorin meets the party at the Masquerade and asks the party for help finding Avacyn, the angel protector of Innistrad. After defeating Olivia Voldaren and Edgar Markov and learning that Avacyn is trapped in the Helvault, the group destroys the Helvault to free the Angel Avacyn which unleashes all the demons trapped inside including a very evil and powerful demon Griselbrand
Currently, the party has been tasked by Sorin to help Innistrad recover after the unleashing of the demons trapped in the Helvault