As of the NovemPatch, the effects of Halloween spells were made visible only during Halloween events, Full Moons, or on servers under the effects of the Enchantment: Eternaween tool item. They were enabled and made obtainable again for Scream Fortress 2013, which lasted from Octoto November 11, 2013. Any spell effects that were applied to any items, along with any unused spells, were erased from players' inventories upon launching Team Fortress 2 after the end of this event. They could be found during Halloween events inside of Haunted Halloween Gifts on Ghost Fort, or from a Pile Of Curses. The Spell Items released during the Scream Fortress 2012 event lasted from Octoto November 9, 2012.

They were added during Scream Fortress 2012, and were enabled and obtainable annually during subsequent Halloween events, prior to Scream Fortress 2015. Halloween Spells are single use tool items that are used to give various Halloween themed effects to weapons, cosmetic items, or classes, depending on the spell.

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