Exorcism Instructions Letter
Letter found on a dead body on Terra Firma in Episode 19-5
I do not know what you have gotten yourself into but if you are going after demons you MUST bring a cleric. However, to answer your question, yes it is possible to exorcise a demon possessed creature without a divine spell caster. It is far more difficult but there are things that you can do to improve your chances.
The exorcism incantation must be spoken aloud and with confidence; it is crucial that the demon hears the words you speak:
Exorcizamus te, omnis immundus spiritus,
omnis abyssus potestas, omnis incursio diabolic adversarii,
omnis legio, omnis congregatio et secta diabolica.
Ergo, draco maledicte.
Ecclesiam tuam securi tibi facias libertate servire,
te mandatum, audi nos.
To enhance the power of the incantation you can have others assist you. They must speak at least one line of the incantation and in the proper order during the exorcism. A holy symbol of a lawful good god in view of the possessed will further weaken the demon as will placing the demon’s vessel in contact with holy water or salt. It is unlikely that a demon will remain still and allow you to exercise it. An unbroken line of salt is not passable by a demon. Salt can also be used to ward a room by placing it across all entrances. This method cannot be used to contain a demon as the salt line must be unbroken to do that. The preferred method for temporarily containing a demon is with a demon trap drawn as illustrated. A demon can step inside but not back out again – for a time.
Be careful my friend.