Here is some further information on the area from Samera regarding unique game mechanics in this area.

Originally Posted by SAMERA, Community Relations: DDO

When you have beaten the dragon and completed the whole quest series, you can’t start the quest series (1-6) again for 66 hours (real-time hours, not in-game hours). However, you can “tag along” with players who are on phases 1-4 of the quest and help them complete Tharashk Arena, Prison of the Mind, Jungle of Khyber or Haywire Foundry (however, when your quest timer resets, you will need to redo parts 1-4 to advance your own quest). You can’t enter the two raid dungeons (Vault of Night and Plane of Night) unless you are on the correct phase of your quest – even if someone else in your party has the correct quest phase. To see how much time is left before you can restart the entire quest sequence again you can either use the /quest command to view all active quest reset timers or check your quest journal.

Loot Mechanic

When you slay the Red Dragon guarding the Vault of Night, you will have a chance to share in the rewards left behind as loot. The dragon’s chest is protected by a pair of objects called the Glyphs of Ward-Breaking, which you must possess in order to pull items out of the dragon’s chest. Two Glyphs will appear next to the dragon’s chest. Only the leader of the party can pick them up. Once they are in the party leader’s possession, he or she may trade them to another party member, allowing that member to choose an item from the chest.

When you take a piece of loot from the chest, your Glyph will be destroyed and you may not choose another piece of loot unless you have the other Glyph. The items are bind-on-acquire, and display a confirmation window to that effect to prevent accidental looting. As bound items, they cannot be traded.

Currently the Plane of Night is the only place in the game where loot works in this manner. The release note “When picking up a Bind on Acquire item that is not reserved (for example, in a treasure chest from which only 1 pull for the Party is possible), there is a confirmation dialogue box opened.” refers ONLY to the Plane of Night. We have not changed the loot mechanics for the entire game.