The quest is repeatable, but there is 1.5 hour lockout timer on the zone.
You need three "Trust" points with the Splitpaw Gnolls to advance to the the final azure shard quest. Completing this quest will give you one point.
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 60.
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.
If you choose (very hard) mode the mobs will be 5-6 levels above yours.
Detonating barrels do about 2500 focus damage.
YES you can take your merc in with you in this instance (some Splitpaw instances are truly solo).