Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Vial of Shadows Compares
Who It Suits
Vial of Shadows carries Agility, the primary stat of Beast Mastery, Marksmanship and Survival Hunter; Assassination, Outlaw and Subtlety Rogue; Enhancement Shaman; Brewmaster and Windwalker Monk; Feral and Guardian Druid; Havoc and Vengeance Demon Hunter.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Vial of Shadows Fits
Other Items Named Vial of Shadows
2 other items in the current build are also called Vial of Shadows. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 77979 (77974 to 77984) were usually added in the same batch as Vial of Shadows: the same quest line, zone, vendor or reward set.