Prime Suspect - p. 2 Dragon Age II Guide
Last update: 11 May 2016
Step 5, Option A: Believing in Gascard's innocence
If you believe Gascard, you will have to let him go by choosing the upper right dialogue option at the end of the conversation #1. Afterwards you can return to the estate #2 (M52, 1). Further description can be found in Step 6.
Step 5, Option B: Killing Gascard
If Gascard's story doesn't convince you and you still think he's the murderer, choose the lower right dialogue option at the end of the conversation #1. It will of course lead to a battle #2 with Gascard and the Shades he calls in.
I'd recommend attacking Gascard from the very beginning #1. He will soon teleport to another room and start running away. It will let you focus on the Shades #2, without having to worry about DuPuis' magic.
You will be able to exit the room only after defeating all the monsters. Look out, as you will be attacked by Shades by the stairs as well #1, but luckily the group won't be very big. Note that the western door is blocked and as a result you will have to go to the previously inaccessible northern door #2 (M52, 8).
Head north and after a while you should reach a rather big library. Start attacking the new Shades inside the room #1. After the fight look around for a locked chest behind the shelves #2 and afterwards choose the northern exit.
Run west. Ignore DuPuis, as you won't be able to get him here. Instead, start attacking the monsters inside the room. I'd recommend starting off with the Desire Demon #1 (M52, 9). Only after eliminating that monster should you focus on the Shades #2.
You will have to be quick with eliminating the Shades, as soon Abominations will start appearing #1. They pose a big threat, so in case you haven't yet eliminated all the Shades, ignore them for a bit and take care of the Abominations. Try to kill them one at a time, keeping an eye on the weaker party members. After the fight use the same exit which Gascard used #2.
You don't have to examine the door downstairs, there's nothing there. Instead go through the southern door #1. You should return to dining room, where the main fight with Gascard will take place #2 (M52, 10).
Even though very strong Abominations will join the fight, Gascard should be the first one to eliminate #1. As you probably remember, blood mages are capable of sucking out life force from living creatures, so he would pose a big threat. DuPuis will unfortunately keep teleporting throughout the whole room #2, but don't give up and keep attacking him until he dies.
Only after eliminating Gascard should you move to the Abominations #1. Don't forget to keep an eye on the health of your party, as you will be probably exhausted after the blood mage fight. Keep the Shades for the end #2. In their case, most of all focus on quickly eliminating monsters with short health bars.
After the battle, I'd recommend searching Gascard's corpse #1 to find, amongst other, the very precious Gascard DuPuis's Favourite Hat. You can now go out of the estate #2 (M52, 1). Further description can be found in Step 6.