From Team Fortress Wiki

“

— Merasmus It's Eternaween! The eternal Halloween! Your calendar... has gone insane! ”

The Enchantment: Eternaween is a single-use tool item that can be used to enable Halloween/Full Moon restricted items to use on a registered server for two hours, though it is required that other players give consent to it being activated. Successfully passing a vote triggers voice lines from Merasmus. Voting must be enabled on servers for this item to work.

Bugs