The pieces for this set are obtained by turning in a piece of Desecrated armor along with materials listed in each quest to Rohan the Assassin who is in Light's Hope Chapel in the southwest corner of the church. The ring, of course, is not obtained this way and is simply (ha!) a drop from Kel'Thuzad.

Also available as the 9th piece is a ring with the following stats:
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Bonescythe Ring
Unique
Finger
20 Strength
20 Agility
10 Stamina
Equip: Improves your chance to hit by 1%.
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Rogues seeking to utilize the eight-piece bonus from this set have popularly been replacing the belt with Belt of Never-ending Agony (C'Thun). (1.12)

Drops required for turn-ins are as follows:
Desecrated Bracers - Grand Widow Faerlina, Anub'Rekhan, Gluth
Desecrated Breastplate - Four Horsemen
Desecrated Gauntlets - Maexxna
Desecrated Helmet - Thaddius
Desecrated Legplates - Loatheb
Desecrated Pauldrons - Patchwerk, Grobbulus
Desecrated Sabatons - Instructor Razuvius, Gothik the Harvester
Desecrated Waistguard - Noth the Plaguebringer, Heigan the Unclean
Desecrated Ring - Kel'Thuzad

Ring isnt desecrated, kel'thuzad drops the actual ring for every class

Total materials for Bonescythe (excluding the BOP items):

106 Wartorn Leather Scrap
5 Arcanite Bar
42 Cured Rugged Hide
5 Nexus Crystal
275 gold

Monstrado's Model Viewer:
http://img164.imageshack.us/img164/5434/bonesythegf5.jpg http://img164.imageshack.us/img164/5434/bonesythegf5.jpg

Enjoy!

Rough calculations for rogues with higher critical hit percentages (particularly dagger-wielding rogues using Backstab) indicate that the 4-piece bonus on this set will have returns equal to or better than those of Adrenaline Rush, just spread out over a longer period of time.

Thus, this set bonus is likely to be one that will encourage many rogues to hold on to at least 4 pieces until well into the Expansion.

The other materials are as follows:

Head
15 Wartorn Leather Scraps, 1Nexus Crystal, 8 Cured Rugged Hide, and 75 gold
Shoulders
12 Wartorn Leather Scraps, 1 Nexus Crystal, 5 Cured Rugged Hide, and 50 gold
Chest
25 Wartorn Leather Scraps, 6 Arcanite Bars, and 2 Cured Rugged Hide
Pants
20 Wartorn Leather Scraps, 1 Arcanite Bars, 8 Cured Rugged Hide, and 100 gold
Gloves
8 Wartorn Leather Scraps, 1 Arcanite Bars,and 5 Cured Rugged Hide
Boots
12 Wartorn Leather Scraps, 2 Nexus Crystal, 3 Cured Rugged Hide, and 25 gold
Belt
8 Wartorn Leather Scraps, 1 Nexus Crystal, 5 Cured Rugged Hide, and 15 gold
Bracers
6 Wartorn Leather Scraps, 1 Arcanite Bars, 2 Cured Rugged Hide, and 10 gold

Desecrated Items drops from following bosses in Naxxramas:

Bonescythe Bracers - Anub'Rekhan, Gluth, and Grand Widow Faerlina
Bonescythe Breastplate - The Four Horsemen
Bonescythe Gauntlets - Maexxna
Bonescythe Helmet - Thaddius
Bonescythe Legplates - Loatheb
Bonescythe Pauldrons - Gluth, Grobbulus, and Patchwerk
Bonescythe Sabatons - Gluth, Instructor Razuvious, and Gothik the Harvester
Bonescythe Waistguard - Gluth, Heigan the Unclean, and Noth the Plaguebringer
Bonescythe Ring - Kel'Thuzad

Quest Materials :
Head
15 Wartorn Leather Scraps, 1Nexus Crystal, 8 Cured Rugged Hide, and 75 gold
Shoulders
12 Wartorn Leather Scraps, 1 Nexus Crystal, 5 Cured Rugged Hide, and 50 gold
Chest
25 Wartorn Leather Scraps, 6 Arcanite Bars, and 2 Cured Rugged Hide
Pants
20 Wartorn Leather Scraps, 1 Arcanite Bars, 8 Cured Rugged Hide, and 100 gold
Gloves
8 Wartorn Leather Scraps, 1 Arcanite Bars,and 5 Cured Rugged Hide
Boots
12 Wartorn Leather Scraps, 2 Nexus Crystal, 3 Cured Rugged Hide, and 25 gold
Belt
8 Wartorn Leather Scraps, 1 Nexus Crystal, 5 Cured Rugged Hide, and 15 gold
Bracers
6 Wartorn Leather Scraps, 1 Arcanite Bars, 2 Cured Rugged Hide, and 10 gold

Total:
106 Wartorn Leather Scrap
5 Arcanite Bar
42 Cured Rugged Hide
5 Nexus Crystal
275 gold

Bonescythe Totals:
Armor: 1456 /Strength: 124 / Stamina: 180 / Agility: 154 / attack power: 210 / Critical strike chance (%): 10 / Chance to hit (%): 7%

Bonuses gained from wearing multiple set items:

2 pieces: Your normal melee swings have a chance to Invigorate you, healing you for 90 to 110.
4 pieces: Your Backstab, Sinister Strike, and Hemorrhage critical hits cause you to regain 5 energy.
6 pieces: Reduces the threat from your Backstab, Sinister Strike, Hemorrhage, and Eviscerate abilities.
8 pieces: Your Eviscerate has a chance per combo point to reveal a flaw in your opponent's armor, granting a 100% critical hit chance for your next Backstab, Sinister Strike, or Hemorrhage.

Seems there will never be a complete armor set like Bonescythe for a long time. Even the new riad armor sets available in the BC dont really compare to the completeness of this set..

Hope blizz offers something more comparable in the LK Expansion.

Cheers,
X

Theloria Shadecloak, a high elf questgiver in Terrokar Forest, is wearing this armor. She makes it look pretty awesome on an elf frame:

https://vanillawowdb.com/?npc=18565 https://vanillawowdb.com/?npc=18565

Kialon Nightblade, an alliance questgiver in Blade's Edge Mtns, also shows it off pretty well:

https://vanillawowdb.com/?npc=18098 https://vanillawowdb.com/?npc=18098

Note that the chest armor, unlike T6, has a high neck, similar to the Bloodsea Brigand's vest from Karathress.

As of Wrath of The Lich King expansion,this is no longer available.

Naxxramas moved to Northrend,a Tier 7 set is obtainable here for level 80 players.

I still have a rogue at 60 with Full 9/9 and i have to say i miss the Set Bonuses from pre BC

http://us.battle.net/wow/en/character/daggerspine/Khan%C3%B8/simple http://us.battle.net/wow/en/character/daggerspine/Khan%C3%B8/simple

Anyone notice that none of the armor requires a class except the ring?

The best looking rogue set in my opinion.

Other good-looking items are the ones from sunwell plateau, but they are not a set => t3 is the best looking rogue set EVER.

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

Bonescythe Armor
1456 Armor
+154 Agility
+180 Stamina
+114 Strength
Equip: Increases your critical strike rating by 140.
Equip: Increases attack power by 210.
Equip: Increases your hit rating by 70.