Received from: Arl Eamon [Denerim - Arl Eamon's estate]
Description: After this has quest has officially appeared in your journal leave the estate and travel to [Denerim - Elven alienage] (M66, 1) using the passageway found in the market district or by choosing the correct location from Denerim map. Head forward after your arrival. Don't forget to talk to civilians you meet along the way, including Soris found in [Denerim - Elven alienage - Cyrion's house]. The most important thing for you to do here is to proceed to the central area of the alienage where you'll witness a dispute taking place. Talk to Shianni the first chance you get to find out more about the plague and about the disappearances of other elves. You'll find out that weird things are happing inside the hospice and that there's a way of entering it using the back door.
Naturally your first step will be to visit the hospice and there a few ways of gaining access to it. The most obvious solution would be to attack healer Veras and other of Loghain's men stationed in the surrounding area (M66, 9) and it would be easy to provoke them during the initial conversation. The less obvious solution is to proceed to the back of the building to talk to one of the guards (M66, 12). You could attack him (no one else will join the fight) or bribe him to leave his post. Either way you'll have to collect a key to the hospice.
You may now enter [Denerim - Elven alienage - Tevinter hospice] (M68, 5) where you'll have to get rid of a small group of guards. You must now explore a small room found in one of the corners of the hospice (M68, 6). Rescue some of the elven slaves being held here and once they're free head back outside. Don't forget to use the back door again, so you won't be seen, because otherwise you would have to deal with Loghain's men (including two mage mini-bosses). Return to Shianni (M66, 4), tell her about what you've discovered in the hospice and she'll respond by saying that the leader of their tribe wasn't among the rescued elves.
Return to the back of the hospice, however this time check a nearby alley and eventually you'll locate a door leading to [Denerim - Elven alienage - Rundown apartments] (M66, 10). Once you're inside the building (M68, 1) proceed directly to the last room which is going to be guarded by Loghain's men (M68, 3). Defeat them and pick up a note found on a small table. You can now return with the note to Shianni (M66, 4) to share the news or you can continue your journey without leaving the building.
Focus on finding the next door (M68, 4) which you'll be allowed to open using a key found along with the note. Once you're back outside (M66, 11) you'll automatically start a conversation with one of the guards. Sadly you won't be allowed to convince him that you're one of the bad guys, so as a result you will have to attack him as well as his colleagues. Winning here shouldn't be a problem as long as you pay attention to enemy archers. Make sure to save your game before opening a door leading to [Denerim - Elven alienage - Tevinter warehouse] (M66, 13), because you'll have to make an important decision on how this quest should end.
Once you're inside [Denerim - Elven alienage - Tevinter warehouse] (M68, 7) you'll automatically trigger a new conversation with Devera and her bodyguards. You should know that even if you kill her you won't lose a chance of choosing the ending, however I would recommend playing it safe, so you won't put your team at risk. If you plan on choosing an ending suitable for an evil character you should ask her to take you to Caladrius (M68, 8). If you plan on choosing an ending suitable for a good-hearted character you should scare her away using intimidation or attack her right now. Even if she's dead or not here anymore you'll still be allowed to go to Caladrius and he won't automatically attack you. The only difference is that you would have to travel through several rooms filled with enemy units and traps instead of being automatically transported to the last chamber.
This is an ending for an evil character. Start off by travelling to the last chamber (M68, 8) and this can be done automatically (if you convince Devera of your good intentions) or after dealing with all hostile units met inside the warehouse. During the conversation with Caladrius you must express the feeling that you want to achieve some kind of a compromise. You can now bribe Caladrius by paying him 100 gold coins or convince him to change his mind by using persuasion. In both cases he would leave Denerim with his slaves and you would receive documents needed to implicate Loghain.
This is an ending for a good character. Before you reach the last chamber (M68 ,8) you should consider getting rid of Devera (M68, 7), because otherwise she would take part in the battle. After you've started the fight focus on defeating at least some of the bodyguards before attacking Caladrius himself. I wouldn't recommend retreating to any of the previous rooms, because Caladrius would still be able to use his spells to injure you or your teammates.
Start attacking the boss after you've dealt with most of his warriors and at least some of his archers. You won't have to kill all the bad guys, because this battle will come to an end once Caladrius is heavily injured. You can now choose between sacrificing all the lives of the remaining slaves in exchange for receiving a bonus to your attributes (last chance for an evil character) and dismissing his final offer. If you refuse to kill the slaves you can decide to let Caladrius go or you can finish him off. Either way you'll get your hands on documents implicating Loghain. If you've decided to keep the slaves alive you'll also be allowed to talk to Valendrian.