You can get the Dragoncrest Shield Talisman at the Bestial Sanctum. You can get here by travelling through Caelid or by using a teleport in the small lake north of the Third Church of Marika ...

Wearing this talisman increases your damage reduction to all sorts of Physical Damage by 17%. While it's similar to the Dragoncrest Greatshield Talisman, you can't use both simultaneously.