• Invulnerable Mail
• Item Level 63Disenchants into:
  [Nexus Crystal]: 1-2
• Binds when equipped
  
• Mail
• Chest
• 611 Armor
• Durability 140 / 140
• Requires Level 57
• Equip: When struck in combat has a 5% chance to make you invulnerable to melee damage for 3 sec. This effect can only occur once every 30 sec.
  Equip: Increases defense rating by 20
• 
• Sell Price: 4 38 36

Invulnerable Mail is mail chest armor. It is a somewhat unusual item; it is probably most useful to shamans who are looking to increase their ability to tank and survive in melee.

Source

Invulnerable Mail is crafted by Blacksmiths with a skill level of 300.

The components are:

• 30 Arcanite Bar
• 30 Enchanted Thorium Bar
• 6 Huge Emerald
• 6 Azerothian Diamond

The plans drop off creatures in their levels in the high 50s and low 60s.

Notes

Due to the price and rarity of the Arcanite Bars required to craft this, very few people will actually want to purchase and/or have this crafted. The armor itself was very good but the expenses could be sold and used to purchase somthing better and cheaper.

At some point, armorsmithing was removed as a requirement to learn the recipe for this.

Patch changes

• Patch 1.7.0 (13-Sep-2005): Invulnerable Mail changed to a lower duration effect, but your own melee swings will not interrupt the invulnerability. 
  

External links

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