Help Defeating Archdemon-DA Origins

[Verex]

Party:
Allister
Wynn
Oghren- Equipped with battle axe, no crossbow
Main Character: Rogue

The problem that I keep running into is once the Archdemon is at 50% health my party gets hit with Spirit Smite. That plus the summoned darkspawn deal quite a heavy damage to my party. Is there any way to lessen damage taken or something to stop the archdemon from dealing that special attack?

 

[alphamalet]

You want to know what I did? It's totally cheap, but set your party to "hold position" and place each of them at the ballistas (the massive arrow cannons). Spam arrows, and change to the party member who is closest to the Arch Demon when it moves. The arrows stun the Arch Demon.

It's cheap, but it works. Make sure you have some pots on hand.

 

[Verex]

Ah, yes. I can give this a try. Should work out. Wish me luck.

 

[DragonStorm247]

You want to know what I did? It's totally cheap, but set your party to "hold position" and place each of them at the ballistas (the massive arrow cannons). Spam arrows, and change to the party member who is closest to the Arch Demon when it moves. The arrows stun the Arch Demon.

It's cheap, but it works. Make sure you have some pots on hand.

This. And don't forget to bring out your army when the darkspawn backup comes in.