With the repop timers on these rats being what it is... it requires several groups to even GET the chance to attack the Dragon. The shade will spawn here sometimes and so will a "trapped dracoliche". No guarantees on getting the Trapped Shade to spawn (so 3 mobs on rotation). It should be an easy enough kill since you'll have several groups going to clear the mobs anyways.
This mob did drop a restless ore also.