• Relentless Gladiator's Satin Mantle
• Item Level 251Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Cloth
• Shoulder
• 254 Armor
• +122 Stamina
  +54 Intellect
• Yellow Socket
• Socket Bonus: +6 Stamina
• Durability 60 / 60
• Classes: Priest
• Requires Level 80
• Requires personal and team arena rating of 2000
• Equip: Improves critical strike rating by 63.
  Equip: Improves your resilience rating by 71.
  Equip: Increases spell power by 116.
• 
• Relentless Gladiator's Raiment (5 pieces)
• [Relentless Gladiator's Satin Hood]
  [Relentless Gladiator's Satin Robe]
  [Relentless Gladiator's Satin Leggings]
  [Relentless Gladiator's Satin Mantle]
  [Relentless Gladiator's Satin Gloves]
• (2) Set: +100 Resilience Rating.
  (2) Set: Increases spell power by 29.
  (4) Set: Reduces the duration of the Weakened Soul effect caused by your Power Word: Shield by 2 sec.
  (4) Set: Increases spell power by 88.

Source

This item is sold by the following vendors for 10,550 600 :

•  Big Zokk Torquewrench <Arena Vendor> in Netherstorm
•  Evee Copperspring <Arena Vendor> in Gadgetzan
•  Nargle Lashcord <Arena Vendor> in Dalaran

This item is also sold by the following vendors for 60 :

•  Arcanist Uovril <Emblem of Frost Quartermaster> in Alliance
•  Magister Arlan <Emblem of Frost Quartermaster> in Dalaran
•  Goodman the "Closer" <Emblem of Frost Quartermaster> in Icecrown Citadel

Patch changes

• Patch 3.2.0 (04-Aug-2009): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB