Circle of Drakes

Task statement:
It seems that some drake magi are working their foul magic inside the Nest. You must stop them from forming a circle and completing their spell. From what we can tell, it will take five drakes to complete the circle. They must be killed before they can form their circle. It's possible that the survival of Norrath hangs in the balance.

Reward: 7 crystals as well as X of the following:
Cape of Dragon Scales
Necklace of Grimspirit Beads
Ore of the Nest
Disc of the Dragon Kind

This trial consists of five waves of drakes. First wave is only one drake, second wave is two, up to five on the fifth wave. In addition, the drakes get harder each wave. The event is timed so you must kill fairly quick. When completed a chest spawns with loot.

ToDo: How many loots drop per clear? Any AE's? Slowable, mezzable, rootable?