Spread out with atleast 10 yards between all the players. The choking smoke bomb dot is a huge problem doing 5000 nature dmg pr second for 40 seconds. Dont let more than one player be affected!
When you get marked by Mark of Silence you'll get hit by a knife that silences and inflicts physical dmg, so stay clear of that.
At low health Asira sets up a blade barrier that reduces all dmg below 30,000 dmg to 1 damage, so use your long cast time spells life fireball etc or Thrall's Lava Burst (50,000 fire damage) to cancel it out. After you've canceled it out she puts up another that works the same way, only with 25,000 - 1 dmg reduction.
Remember to use Thralls totem to boost hp regen and dmg output, and use Healing Wave if he gets low on health.
