The Possesion of Tyr Twig

The Possession of Tyr Twig

Intro: In the house of devoted followers of Tempus, who live not that far away from the Temple, you're asked by Father Argus to help him out with what's happening there. For some reason, the entity behind the boy named Tyr knew the name of Morah and asked for him specifically and otherwise refuses to communicate or let go of the boy. Father Argus speaks in an accent of someone who's portugese. 
Task: Before exorcising the demon, you must find out who it is by finding out a few things about the possessed, as it's known that marks appear as proof of the possession and tells one of the demons more than it would want that.
Marks: If you find more than two marks on the body that are left by the demon, two things are sure - it's a powerful demon, which only leaves certain options but still way too many to understand. ((Perception or investigation DC 15))
Speech: See if it understands infernal or abyssal if the creature once again understands both, you can make the assumption it's a strong demon which leads to not too many options and it's so far the second proof the demon is strong.
Eyes: Show the symbol of Tempus to the demon, move it left and right, and watch its eyes. The final clue that the eyes are like snakes tells you the name - Asmodeus.
Now that you know: Asmodeus will make sure to threaten the players and once the exorcism starts it's 3 rounds of surviving 3 Shadow demons before the demon is exorcised from Mr. Twig.