Kill 6 void-touched creatures (juvenile lava crawlers, or void-touched goblins); two spawn at ( -222, -112, 227 ) /waypoint -222, -112, 227 and have a very fast respawn. There are others at the outer entrance to the instances ( -122, -129, 369 ) /waypoint -122, -129, 369.
Kill a Void attacker at the first turn in the path when you enter Najena's Dungeon ( -77, -129, 345 ) /waypoint -76.50, -129.46, 344.85.
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