Caladrius

The leader of the slave traders that are operating in the Tevinter Warehouse, he has been papers allowing him to operate with slaves signed by by Teyrn Loghain.

Involvement
A Blood Mage that is involved in the slave trading business. Once defeated he will offer to sacrifice all of the slaves around him to further your strengths, if you do this you will lose 10 approval with Alister and 40 from Wynne, assuming you have those members in your party. Although killing him doesn't earn you any approval from Alister or Wynne.

Strategy
Area of effect spells such as Blizzard, Earthquake and Tempest are extremely effective since they are all ranged and in the same spot as you enter. Although you will be stunned by the archers, after you cast an earthquake or a blizzard, it becomes a lot easier to deal with the 2 soldiers on either side.