The Enemies Among Us quest of this Dragon Age 2 Walkthrough will have the player explore a conspiracy among the Templar Order. Players will ultimately discover a group of Blood Mages corrupting recruits within the Templars by infusing them with demons, and battle the mages along with their demon allies at the end of the quest.

1. Head out and go towards to Hightown (make sure to switch the Day version).
2. Speak with the woman (her character will be highlighted) and accept to help her with her brother. She will also be marked with a quest arrow/mark.
3. Head out to the Gallows and speak to the highlighted recruits.
4. After you speak with the  recruits and get new information, head out of the area and choose Sundermount on your map. Click on the Wilmod’s camp area.
5. Help the Captain defeat the Anominations. As usual, try to keep the enemies off your ranged party members, and use AOE whenever enemies are closely packed.
6. Leave the area, and go to Hightown at night.
7. You will be ambushed by a group of enemies, but it shouldn’t be too much of a problem.
8. Head towards the quest location and enter the bar.
9. Speak with the woman nearby and ask her for information on the men.
10. Go up the stairs and then right towards the quest mark.
11. Speak with the woman.
12. You can choose to kill the woman, or extract the answers from her. Either way, your quest will next lead you to the blood mages hideout in Darktown.
13. Head towards the quest arrow. If you have a lot of quests here, simply head to the middle of the zone, and then head down into the Sanctuary.
14. Head down into the Sanctuary, until the enemies start appearing. Immediately walk back up to the door with your party, and wait for all the enemies to walk to you. This will greatly trivialize the fight, by allowing you to simply AOE down the majority of the enemies quickly in one area.
15. Head deeper into the compound, following the quest arrow.
16. Speak with the Blood Mages. After the talk, you will have to fight them. This fight is actually quite simple. Just make sure to focus down first the main mage (the one you spoke with), and then the Desire Demon.
17. Speak with Keran.
18. Head to the Gallows to speak with Cullen.
19. Convince Cullen to let Keran stay a Templar.