This quest can be either a Solo or Heroic quest, depending on the path you take.
This quest scales with the level of the player and spans from 20 to 50.
If you kill all monsters in either wing, then a boss monster will spawn near the entrance. You may choose to kill this monster for treasure before leaving the instance. Quartermaster Girtor (^ level+1) spawns if you clear the solo wing, Raider Captain Xerag (^^^ level+1) spawns if you clear the heroic wing.
There is a solo path, which is to the right from entrance; as well as a heroic path, which is straight ahead from entrance.
If a mob is near to the barrel it will take damage and if you are invis/stealth it will break. If the damage isn't enough to kill the mob, it will come after you.