Curse of Doom

Vendor: Veridis Fallon

Zone: Azsuna

Faction: Court of Farondis - Revered

Cost: 500 (unlimited supply)

Profession: Archaeology - Tol'vir

Artifact: [Crawling Claw]

World Event: Hallow's End

Quest: The Creepy Crate [10] (Alliance)/(Horde)

Drop: Sha of Pride [??+]

Zone: Siege of Orgrimmar (Flexible, Normal or Heroic)

Approximate Drop Rate: 1 in 125

Trading Card Game: Betrayal of the Guardian

Quest: DANGER: Kosumoth the Hungering [110]

Zone: Eye of Azshara

Trading Card Game: Worldbreaker

Drop: High Astromancer Solarian [??+]

Zone: Tempest Keep

Approximate Drop Rate: 1 in 11

Pet Store 

Pet Battle: [6-7] Hillsbrad Foothills

Pet Battle: [1-2] Undercity; [1-2] Tirisfal Glades

Drop: Fel-Touched Pet Supplies

Zone: Tanaan Jungle [100]

Approximate Drop Rate: Unknown

Drop: Mother Shahraz [??+]

Zone: Black Temple

Approximate Drop Rate: 1 in 25

Pet Battle: [25] Stormheim

Pet Battle: [20-22] Borean Tundra; [20-22] Howling Fjord; [21-22] Sholazar Basin; [21-22] Grizzly Hills; [22-23] Zul'Drak; [22-23] The Storm Peaks; [22-23] Icecrown; [22-23] Dragonblight; [22-23] Crystalsong Forest

Drop: The Lich King [??+]

Zone: Icecrown Citadel

Approximate Drop Rate: Unknown