The only weapon that can destroy a demon completely is a demon killing knife. We aim to save as many possessed souls as possible so we do not advocate for killing except under the most extreme circumstances. However, there may be times when killing is the only option.
Step One: Acquire a titanium knife
Step Two: Have the knife blessed by a priest
Step Three: Carve this sigil into the blade
If you carry this knife with you, you must be prepared to take the life of the host as well as destroying the demon. Do not carry if you cannot do this.