I think it looks pretty sick myself, wondering where the ring is for the set? 9 piece.

From a raiding warlock's PoV, this set is barely a sidegrade to a mix of T2.5 (Doomcaller), 2 pieces Plagueheart for the set bonus and C'Thun's gloves (Dark Storm Gauntlets). The 5 piece bonus from Doomcaller, despite having a bit less damage (you lose +15 damage from the T2.5/PH/DSG set from PH), will far outweight all of the other bonuses from Plagueheart in terms of sustained DPS: 15% mana cost reduced for shadowbolt should not be underestimated as it saves you about a shadowbolt every 7 cast.

Reconsidering my earlier comment, along with the changes brought with patch 2.0 that helps the affliction warlock a bit, one could now argue that Plagueheart fills its role as a heavy affliction set, and the set bonuses somewhat confirms that, providing boosts to corruption damage, threat mitigation and helping with reducing self mutilation through lifetap.

Requires Desecrated Armor along with other items to be turned into a quest npc(except the ring).

Desecrated Armor is dropped in Naxxramas off certain bosses.

The following is a list of what boss drops what:

Head-Thaddius
Shoulders-Gluth, Grobbulus, and Patchwerk
Chest-The Four Horsemen
Pants-Loatheb
Gloves-Maexxna
Boots-Gluth, Instructor Razuvious, and Gothik the Harvester
Bracers-Anub'Rekhan, Gluth, and Grand Widow Faerlina
Belt-Gluth, Heigan the Unclean, and Noth the Plaguebringer
Ring-Kel'Thuzad

The other materials are as follows:

Head
15 Wartorn Cloth Scraps, 3 Mooncloth, and 3 Nexus Crystals
Shoulders
12 Wartorn Cloth Scraps, 2 Mooncloth, and 3 Cured Rugged Hide
Chest
25 Wartorn Cloth Scraps, 4 Mooncloth, and 2 Nexus Crystals
Pants
20 Wartorn Cloth Scraps, 2 Nexus Crystals, and 4 Mooncloth
Gloves
8 Wartorn Cloth Scraps and 4 Mooncloth
Boots
12 Wartorn Cloth Scraps, 2 Mooncloth, and 3 Cured Rugged Hides
Belt
8 Wartorn Cloth Scraps, 2 Arcane Crystals, and 2 Mooncloth
Bracers
6 Wartorn Cloth Scraps, 1 Arcane Crystal, and 1 Nexus Crystal

Felheart to Nemesis

Armor : -94
Stamina : -9
Intellect : -16
Spirit : -9
Fire Resistance : -6
Shadow Resistance : -6
Nature Resistance : -10
Frost Resistance : -10
Arcane Resistance : -10
Spell Hit Rating : +8
Spell Critical Strike Rating : -28
Damage and healing done by spells : -207
Health Regneration : -12

Nemesis to Plagueheart

Armor : -113
Stamina : -51
Intellect : -31
Spirit : +42
Arcane Resistance : +10
Shadow Resistance : +30
Fire Resistance : +40
Frost Resistance : +10
Nature Resistance : +10
Spell Critical Strike Rating : -56
Health Regneration : -12
Damage and Healing done by Spells : -87
Spell Hit Rating : -24

Felheart to Plagueheart

Armor : -207
Stamina : -42
Intellect : -15
Spirit : +51
Fire Resistance Rating : +34
Shadow Resistance Rating : +24
Spell Hit Rating : -16
Spell Critical Hit Rating : -84
Damage and healing done by spells : -169

Nemesis is good for dungeons , alot of resistance , health regeneration etc. , Plagueheart is perfect set for PvP alot of crit, hit, damage spells, spell hit rating..., felheart not that good

Really the best looking tier set I've ever seen. Be prepared to see it again with the level 80 naxxramus

Fun Fact: there are mobs in BEM that wander around wearing this set. wonder how many times they did naxx!

Just mentioning that you can no longer get this set at lvl 60 becuase Naax is now lvl 80

set bonus 8: ride in single file to hide your numbers.

I'm curious on the likelyhood that if a lvl 80 warlock set collector with the original lvl 60 quests for the T3 set (to be rewarded when turning in items in EPL dropped from Naxx-namely the Desecrated Armor and Wartorn Cloth Scraps) can complete that quest as the preceeding one was able to be completed in the now lvl 80 raid. If you complete the questline the Plagueheart Raiment set quests are still available to be accepted (as of 06/08/09).

The fact that my lock will never have this set makes my soul die a little bit every time I think about it....

As you can see this text is missing in item description of all t3 items:<b>""This item is no longer available within the game.""</b>
Check the black market!