From Team Fortress Wiki
I'm gunnin' for ya, you mongrels!
— The Sniper on demon hunting
The Holy Hunter is a headwear item for the Sniper. It is a blood-stained slouch hat emblazoned with a cross; four silver bullets are secured to the band.
This item can only be worn around Halloween or during a Full Moon; at other times of the year, it does not appear in gameplay, unless the server has Halloween mode enabled. However, it can be equipped at any time and can still be viewed on the loadout screen even when it is not visible during games.
October 27, 2011 Patch (Very Scary Halloween Special)
- The Holy Hunter was added to the game.
- In traditional folklore, a cross can repel or even kill a vampire, while silver bullets are used to kill werewolves.