The other materials are as follows:

Head
15 Wartorn Chain Scraps, 4 Arcanite Bars, and 2 Nexus Crystals
Shoulders
12 Wartorn Chain Scraps, 2 Arcanite Bars, and 2 Mooncloth
Chest
25 Wartorn Chain Scraps, 4 Arcanite Bars, and 3 Cured Rugged Hide
Pants
20 Wartorn Chain Scraps, 3 Arcanite Bars, and 5 Cured Rugged Hide
Gloves
8 Wartorn Chain Scraps, 1 Arcanite Bars,and 5 Cured Rugged Hide
Boots
12 Wartorn Chain Scraps, 3 Nexus Crystal, 1 Arcanite Bars
Belt
8 Wartorn Chain Scraps, 3 Nexus Crystal, 1 Arcanite Bars
Bracers
6 Wartorn Chain Scraps, 1 Arcanite Bars, 2 Cured Rugged Hide

Desecrated Items drops from following bosses in Naxxramas:

Earthshatterer Headpiece - Thaddius
Earthshatterer Spaulders - Gluth/Instructor Razuvious/Gothik the Harvester
Earthshatterer Tunic - The Four Horsemen
Earthshatterer Wristguards - Anub'Rekhan/Grand Widow Faerlina
Earthshatterer Handguards - Maexxna
Ring of the Earthshatterer - Kel'thuzad
Earthshatterer Legguards - Loatheb
Earthshatterer Girdle - Gluth/Noth The Plaguebringer/Heigan the Unclean
Earthshatterer Boots - Patchwerk/Grobbulus

Quest Materials :

Head
15 Wartorn Chain Scraps, 4 Arcanite Bars, and 2 Nexus Crystals
Shoulders
12 Wartorn Chain Scraps, 2 Arcanite Bars, and 2 Mooncloth
Chest
25 Wartorn Chain Scraps, 4 Arcanite Bars, and 3 Cured Rugged Hide
Pants
20 Wartorn Chain Scraps, 3 Arcanite Bars, and 5 Cured Rugged Hide
Gloves
8 Wartorn Chain Scraps, 1 Arcanite Bars,and 5 Cured Rugged Hide
Boots
12 Wartorn Chain Scraps, 3 Nexus Crystal, 1 Arcanite Bars
Belt
8 Wartorn Chain Scraps, 3 Nexus Crystal, 1 Arcanite Bars
Bracers
6 Wartorn Chain Scraps, 1 Arcanite Bars, 2 Cured Rugged Hide

Total : 106 Wartorn Chain Scrap
17 Arcanite Bar
8 Nexus Crystal
15 Cured Rugged Hide

The Earthshatterers Totals:
Armor: 3186 / Intellect: 226 / Stamina: 196 / Manaregen /5sec: 64 / +Healing: 412

Bonuses gained from wearing multiple set items:

2: Totem cost reduced by 12%.
4: Increases the mana gained from mana spring totems by 25%.
6: *Healing Wave spells have a chance to imbue the target with Totemic Power*
8: While your lightning shield is active you gain 20 mana/5.

*Totemic Power: 10% chance for : - Increases the friendly target's mana regeneration by 28 per 5 sec. for 8 sec.(Druid, Priest, Paladin, Shaman)
- Increases the friendly target's spell damage and healing by up to 80 for 8 sec.(Mage and Warlock)
- Increases the friendly target's attack power by 140 for 8 sec. ( Hunter and Rogues )
- Increases the friendly target's armor by 700 for 8 sec. ( Warrior )

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

If anybody is curious to know what the old stats were I am going to post them here:

The Earthshatterer
3186 Armor
+223 Intellect
+196 Stamina
Equip: Restores 64 mana per 5 sec.
Equip: Increases healing done by spells and effects by up to 412 and damage done by spells and effects by up to 140.

you know all Tier 3 models are reused in Wotlk but with diffrent colors

As of 5.0.4 with the release of mists of pandaria and the black market auction house this set is obtainable again. the black market auction house is located in the veiled star to the east of the tavern in the mists. the starting bid price for the pieces of this set is 10000 gold. and this gear doesn't have a class restriction on it (if you are excluding the ring) so hunters and shamans will be able to transmog this set.

This set looks badass.

Dose anyone know if you can still get this with the current patch 3.1.0 cuzz naxx was moved a while back