WOW Quest:Thunderlord Clan Artifacts (10524)  

• 42,52 The arrow can be found right up a stone ramp, on top of the ramp.
• 40,58 The slab can be found by running past the hut where ghor'dimm is located and is in a small hut just past that.
• 41,46 The drum is in the left hand hut of the three huts in a row. (As opposed to being in the middle or right hand hut as you are facing the doorways.)