Description: Your job will be to locate a group of adventurers and you'll find out that they were on their way to [Denerim] to share the information on the blood mages. Thankfully you won't have to spend too much time looking for them. Exit the town where you got this mission (probably [Redcliffe]) and travel to Denerim. You'll trigger a random encounter showing your team being stopped by the leader of the adventurers. You can use intimidation, persuasion to change his mind or attack him and his friends.
The scrolls of Banastor
Description: The collective will ask you to retrieve five scrolls of Banastor. Two of these objects can be found in [The Circle tower] (M33, 9)(M34, 2), two other scrolls are hidden in the [Ruined temple] (M61, 4)(M61, 6) and the final fifth scroll can be found in [Werewolves lair] (M46, 7).
Description: This quest will require you to leave blood marks on the doors of four houses belonging to the families of the blood mages. Each time you'll have to approach the door and to click on it to leave the bloody sign. Two buildings can be found in [Denerim - Market district] (M64, 4)(M64, 9), the third home is in [Denerim - Dirty back alley] (M69, 2) and the final fourth house can be found in [Denerim - Dark alley] (M69, 3).
A gift of silence
Description: Your job will be to manufacture, buy or find at least ten lyrium potions. Once you have all the potions you'll have to deliver them to the collective. Notice that completing this quest will prevent you from finishing another one - Justice must be served.
Justice must be served
Description: This quest is tied to another mission from this group - A gift of silence. Once you've collected all the lyrium potions for the collective don't go to their representative to hand them over. Instead give the potions to Commander Tavish in [Denerim - Market district] (M64, 5).
Notice of termination
Description: Your job will be to inform three apprentices that the collective doesn't want them anymore. Apprentice Fayd can be found in [Denerim - Market district] (M64, 8), Apprentice Sheth can be found in [Denerim - Market district - Wonders of Thedas] and Apprentice Starrick can be found in [Frostback mountains pass] (M47, 4).
Have you seen me?
Description: The objective of this quest will be to locate Renold. Once again you won't have to pay too much attention to what you're doing, because sooner or later you'll trigger a random encounter linked to his disappearance. You should end up standing in area marked as [Out of the way] and your job will be to defeat a powerful abomination. Once the monster has been killed check Renold's body for his journal.
Places of power
Description: In this case your job will be to locate places of mystical power. The areas you'll have to visit are Brecilian forest (check the tombstone in the western section of the forest), The Circle tower (examine the chair in the middle of the student quarters), Denerim (click on a large tree in the Elven Alienage) and Orzammar (click on an altar in Ortan thaig tied to Asunder subquest). Each time you've found the place of power you'll be informed about it.
Description: This quest will require you to find and deliver ten deep mushrooms. You can start collecting these items during your journeys (make sure to always scan the area for interactive plants) or you can buy them from one of the traders.
The brother's killer
Description: In this case your assignment will be to hunt down and kill Maleficarum mages and in order to locate them you'll have to travel to [Brecilian forest - Eastern part]. The mages can be found in one of few possible locations and you'll probably be allowed to get to them only when you've already figured a way to cross the invisible barrier in the forest. Approach the mages, talk to one of them and start the fight. Make sure to eliminate weaker mages in the first place and once they're gone attack the two remaining mini-bosses.