This is part of the set of quests which convert your Dungeon Set 1 gear into Dungeon Set 2. In every case, the quest starts from Delina and is called An Earnest Proposition. Because the upgrade quests are available to all classes on both sides, there are actually 18 quests with this name (9 classes x 2 "sides").

The quests are rather involved and require a significant amount of travel to complete. In some cases, you will require groups to complete the associated dungeons or the summons in Silithus. Although 8 of 8 pieces of Dungeon Set 1 are not required to start the quest, it is proposed that the Dungeon Set 1 bracers are required to begin the quest chain - the other pieces of Dungeon Set 1 can be collected along the way.

Dungeon Set 2 is, in appearance, recolored versions of Dungeon Set 1.

More information, and an extensive write-up, can be found at WoWWiki.com.

Copied from http://www.wowwiki.com/Tier_0.5

Step Three: Pants, Shoulders, and Boots
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Baron Rivendare

Your next step takes you, along with the Extra-Dimensional Ghost Revealer, to the entrance of Stratholme to talk with the ghost of Anthion Harman. He asks you to rescue Ysida Harmon from Baron Rivendare. The quest is a timed event, requiring the group to engage Baron Rivendare in combat within 45 minutes once the second gate from the Stratholme service entrance has been opened.

* NOTE: The rumour about using Spectral Essence to talk to the prisoner at the end is not true. Did strath in 1h on 3/30, and equipping at the end didn't reveal anyone.

* WARNING: Using the Medallion of Faith and summoning Aurius for the Baron Rivendare fight seems to break the quest script and hence making this quest impossible to complete.

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Gathering Mats

After the 45 min baron run you return to the ghost and he asks you for 3 Dark Iron Bar, 3 Mooncloth, 20 Enchanted Leather, and 4 Cured Rugged Hide. After you turn these in, he sends you to Dire Maul library to talk to Falrin Treeshaper.
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Ogre Warbeads

Falrin Treeshaper in Dire Maul gives you a quest to gather 25 Ogre Warbeads off the ogres in Dire Maul and Lower Blackrock Spire. The droprate goes (roughly) as follows: Dire Maul (Outside): 1:30, Dire Maul (North): 1:5, Lower Blackrock Spire: 1:2.

Although the drop rate is much higher in Lower Blackrock Spire, there is also much fewer ogres in that instance. It will require multiple runs of either instance to obtain all of the Ogre Warbeads required.
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Jeering Spectre's Essence

Once you have 25 Ogre Warbeads, you return to Falrin Treeshaper. He will send you to gather 4 Dark Rune, 8 Large Brilliant Shard, and 1 Jeering Spectre's Essence (which will drop off ghosts in DM West.) The essence is a group drop and you do not need the quest to recieve it. Afterwards, return to the librarian he gives you a banner to take to BRD. Immediately after recieving the banner, you will be attacked by 5 to 6 ghosts which will spawn close by. It does not seem to matter if you win the battle or not.
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Blackrock Depths: Top Piece of Lord Valthalak's Amulet

Once you get the banner, you have to go to BRD and kill Theldren's Army and retrieve the Top Piece of Lord Valthalak's Amulet. To do this, just go in the arena, use the banner, and destroy all the mobs that come out of the gates.

Posted on the WOW forums by Kebax:

Requires you to kill a group of elite NPC's that are smarter than a average NPC. You need basically at least 2 forms of crowd control or it its nearly impossible. I did it today with a group of me, a warrior, 3 mages, and a priest. There are 5 NPC's in the group usually and there is mainly a warrior type, a rogue type, a mage type, a shaman type class. The last class is either a Hunter class or a goblin at random. The Warrior type is Theldren the dwarf which is the hardest NPC out of the group. For Rogue type, it could either be a gnome or a gnoll at random. For Mage type, it is either a Undead or a Razormane dude at random. For Shaman type, it is a tauren in full Element set. If the final class is a hunter, it is usually a Centaur with a non elite hyena as a pet otherwise it will be a goblin. All of these NPC's have the same abilities as a real class. However if the goblin shows up, he will tend to use engineering stuff like bombs and breathe fire and even send his arcanite dragonling. The main targets that need to be crowd controlled is Theldren and the rogue. All of these NPC's are immune to taunt so everyone should be at their best to kill a enemy as fast as possible before they do serious damage to members. If you are a group without crowd control, it is almost impossible unless you are skilled and geared well. Once crowd control is applied this quest will be easy as cake.

After completing the quest, you get another that tells you to go back to Org (or IF) and talk to Mokvar.
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Reward

At this point, you receive your Dungeon 2 Pants, Shoulders, and Boots. (Pants and Shoulders are blue, Boots are epic.)

Edited, Fri Apr 7 11:38:57 2006

dose this quest give you all the rewards or do you have to do it multipal times?