Valve has launched Scream Fortress, its 4th annual Halloween event, adding Zombies, new achievements and much more to Team Fortress 2 for a limited time. Running today through November 8th, the update adds multiple new features including:

• Merasmus: a “bomb-spewing, fate-spinning spectral magician” on King of the Hill maps 
• Wheel of Fate: Every time a control point changes hands, “the Wheel of Fate spins, and one of many potentially horrible fates await you! Or maybe something good! Who knows?” 
• Magic Spells: Spells that add new effects on items in your backpack, including shifting paint colors, ghost summoning, flaming footsteps and more 
• Wave 666: Replaces robots with a single wave of more than 800 Zombies in Mann vs. Machine mode 
• Two new achievements: Wizards Never Prosper (Kill Merasmus) and A Lovely Vacation Spot (Get to Skull Island and claim your reward!)

Valve also released a Halloween-themed Team Fortress 2 comic called Doom-Mates, which you can read on Team Fortress 2’s official site.

Andrew Goldfarb is IGN’s associate news editor. Keep up with pictures of the latest food he’s been eating by following @garfep on Twitter or garfep on IGN.

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