Lt. Fion Iridia

It might be doable, but would probably be rough if things didn't go to plan. What makes the Lt a hard fight is that she can spawn 2 named adds (they don't drop anything) that either have to be CC'd or tanked. The Lt. herself has a high health pool, does aoe fear, and has a few strikes that are "tank busters". If your tank does not parry / dodge / block the attack (I think it's called Decimate or Devastation or something,) they will get chunked for like 1200 damage+ depending on armor / level etc. I would say an enchanter would probably be a necessity if you were going to try to do it at that low of a level so the pet could take the big attack. You're better off getting to at least 39 or 40 to take her out if you want an assured kill. Although it could be fun to try when she's yellow/orange if you and your group is up for a challenge.