First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
Related
Nightrune Doublet Game Data
Appearance
Appearance ID: 27648. No other item uses this appearance, so it is unique to Nightrune Doublet.
Read from the World of Warcraft client build files.
How Nightrune Doublet Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Nightrune Doublet suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Similar Items
The 10 items nearest to Nightrune Doublet (item level 13) in item level among Armor > Cloth, Chest slot, from item level 11 to 16.
Blizzard numbers items as they are created, so the named items next to ID 240015 (240010 to 240112) were usually added in the same batch as Nightrune Doublet: the same quest line, zone, vendor or reward set.