While exploring The Casting of Frank Stone, there are multiple items and unique collectibles to track down throughout your playthrough. One of the collectibles you have to track down are known as Relliks, small dolls of Killers from Dead by Daylight.
Relliks are a direct reference to the Dead by Daylight Killers you can choose for hunting down Survivors. The Casting of Frank Stone is a story set in the Dead by Daylight universe, with multiple references to the source material. These are where you can find all 12 Rellik locations in The Casting of Frank Stone.