Halloween spells are no longer obtainable. Any unused spells were removed from peoples' inventories after November 11th 2014. Some spells are still present in the inventories, but they would be instantly deleted once the owners load the game.

When applied to any of the Engineer's melee weapons, the Level 3 Sentry Gun's rockets gain a purple smoke trail and explode with an orange effect in a similar manner to Pumpkin Bombs.