Template:Item/Series Letters To Hash are a pair of book items found in The Swamp. These items can be found with and without the 'unique' tag in Hounds HQ. In the other locations, they will always be 'unique' letters.
- Blackshifter HQ in overwritten Shark
- Greyflayer HQ in overwritten Shark
- Hounds HQ in Shark
From these letters, players can learn about the history of The Swamp and the stalker gang. ru:Письмо к Гашу