Absent from Forever: this item ID cannot be found in the Forever client. Its Classic version is shown below.
Data source: game client item records. Forever build 1.60.1.70888 ; Classic Era build 1.15.9.70576 . View the compiled item record . A beta record does not confirm in-game availability. Verify acquisition in the game and official announcements.
Source: Razorgore the Untamed, Blackwing Lair
Classic 1.15.9.70576
Mantle of the Blackwing Cabal
Binds when picked up
ShoulderCloth
84 Armor
+16 Intellect
+12 Stamina
Requires Level 60
Equip: Increases damage and healing from all spells and magic effects by up to 34.
Sell Price: 3g 89s 44c
Forever Beta 1.60.1.70888
This item does not exist in the Forever client.