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Right above Thrallmar around 54:26 there is a guy named Warbringer Arix'Amal. For me he dropped about 10s per kill and Mote of Shadow 3 out of every 4 kills.
The thing is, his respawn time is around 15 to 20 sec. So even though the Mote of Shadow and Primal Shadow don't sell for to much, you can farm lots of Mote of Shadow in a short period of time. He is a really easy kill only about 5200hp.
Have funn..