THE SCROLLS OF BANASTOR
The Collective requests that an individual with a certain moral flexibility scour Ferelden for five ancient and powerful Scrolls of Banastor. The scrolls contain information pertaining to "dark and terrible" blood magic rituals.
Depending on how soon you acquire this quest, it can go one of three ways:
Get this quest as soon as possible, because you're going to visit all of the places (as mandated by the plot) anyway. In this way, it pretty much solves itself.
Get the quest later in the game, and just revisit the places.
Simply acquire all five scrolls during the course of the game, then hand them in as soon as you receive the quest in Redcliffe.
Scroll Locations
Senior Mage Quarters of the Circle Tower: (The Circle Tower Lower Levels M, 9) Ancient Texts in the southeast ruined room. In the same room as the first 3 blood mages, but on the other side.
Great Hall of the Circle Tower: (The Circle Tower Upper Levels M, 2)Ancient Texts In first room in the northwest large room.
The Ruined Temple visited in The Urn of Sacred Ashes quest. It is in a library in the southeast corner of the map, (Ruined Temple Map, L4). There are several bookshelves with books on them so you can't miss it.
Western section of the Ruined Temple, called the Cultist Chambers. From the Main Hall map marker (Ruined Temple M, 6), take the west door to the Cultist Chambers area. The scroll is in the room just northwest of the Cultist Chambers map marker, in a pile of books marked 'Ancient Texts'.
Lair of the Werewolves. The scroll is in a pile of books marked 'Ancient Texts' (Werewolves Lair M, 6) in the southeastern chamber, the area just north of your final meeting with the Lady of the Forest and Zathrian. (It is possible to miss this one on your initial visit, due to the cutscene where the Warden interacts with the Gatekeeper wolf. If this happens, simply return to the Lair after the conclusion of Nature of the Beast and collect the scroll.)
Rewards
175 XP
5 gold