The Trusty Slingshot is a Character-specific Item craftable only by Walter using one Twigs and two Mosquito Sacks. Walter also starts the game with one Trusty Slingshot in his inventory. Trusty Slingshots can only be used by Walter.
The Trusty Slingshot is used to shoot Slingshot Ammo with various damages and effects. An inventory slot opens to place Slingshot Ammo when the Trusty Slingshot is equipped.
Attacks from the Trusty Slingshot will not draw aggro if the target is fighting something else.