"A Saint was said to use this item, which is common for households in the past, along with his faith to force the Devil to beg for mercy and swear an oath not to enter any household if the Devil sees this on the door."
This item is NOT the Bible, because the Bible maybe holy but not something you'll see on a door to ward off the Devil. It's not Amulet either as the Amulet is referring to another cultural item instead from east asia.
The correct answer is the horseshoe.
Daraeon Ravensong, JackofShadows, and Jarlaxle Atreides each get 334k and 2 giftboxes!