Ruins of Threnal

House Deneith and House Kundarak have temporarily joined forces to explore and excavate the Abandoned Keep, a settlement deep in the heart of Xen’drik that has lain abandoned for hundreds of years. But the evil that destroyed the settlement 500 years ago still awaits those foolish enough to dig deep enough below the Abandoned Keep.

This adventure zone is accessed through House Phiarlan.

The Western Excavation

 * '''In Need of Supplies
 * '''The Rescue
 * '''Secure the Area

The Eastern Excavation

 * '''The Library of Threnal
 * '''Escort the Expedition
 * '''Hold for Reinforcements

The Abandoned Excavation
The Abandoned Excavation (South) requires to have above two series done in your quest journal.
 * '''The Missing Expedition
 * '''Entering the Gate Chamber
 * '''The Gate Chamber

To repeat, you must talk to Sal Danek (bestower of East series) first and ask "Is there more to do here?" to reset all 3 quest chains. West and East can be repeated individually, but you cannot get advanced to South series that way.

Addendum: To do a fast-repeat of the chain simply check your journal if it has west, east, south listed as completed. Now select west and abandon it. That will reset south and west but will keep you flagged for east. (Can be done with east as well, but who wants to defend Coyle for 15 mins?) Do a fast casual run for end reward. Have Fun!

Source: http://forums.ddo.com/showthread.php?t=276641

Additional Quests

 * '''The Giant Lieutenants
 * '''The Giants' Lair
 * '''The Giants' Supplies
 * '''The Threnal Arena