Dragon Necropolis
 

Wife and I played in here for a couple hours.

Phase Spider Carapace dropped properly, the rarity seems fine on the drop.

There were no traps loaded in Dragon Necropolis. The number of spiders roaming seems low. The Chetari Guard was not on par with other mobs in the zone, well above. I would ask that you check on the difficulty of this common mob or I doubt anyone would try and brave a tunnel group anytime soon.