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Use Weighted Jack-o'-Lanterns to put pumpkin heads on each of the races listed below.

Obtain a Mask during Hallow's End.

Win a ranked arena match in Blade's Edge, Nagrand, Dalaran Sewers, the Ruins of Lordaeron, Tol'Viron Arena and the Tiger's Peak.

Complete the Kalimdor, Eastern Kingdoms and Outland Tricks and Treats achievements.

Get transformed by the Hallowed Wands listed below.

Complete the Hallow's End achievements listed below.

Earn 10 honorable kills while under the influence of the G.N.E.R.D. buff. It's a slap in the face!

Eat so many Tricky Treats that you get an upset tummy.

Kill the Headless Horseman.

Complete one of the quests to save a village from the Headless Horseman.

Receive a handful of treats from one of the Candy Buckets located in an inn.

Defeat every boss in Naxxramas in 10-player mode.

Defeat Kel'Thuzad in Naxxramas in 10-player mode.

Defeat Sapphiron in Naxxramas in 10-player mode.

Possess the effects of Toasty Fire, Storm Power and Starlight at the same time in 10-player mode.