Dropped by the Court Sorcerer in the Profaned Capital. From the Profaned Capital bonfire, go down the interior ladder and through the broken wall, head left and enter the opening on the far right and into a series of hallways that lead to a toxic swamp. Climb up the ladder on the right of the ruined chapel and follow this path until reaching some stairs at the other side. On the chapel's roof is the enemy, kill him to obtain the scroll.
Unlocked sorceries include: