"Wait, how do you even input the order whether right or wrong? Twist the pillars. Press the walls?
Look, in any case, I can't revive you, and I doubt the people back home are people to be bribed with anything, if you want, I could leave a note telling your scholar friends about the 'correct' combination, but that's about as far as I can go."
+1 How powerful is our magic? Since we don't specialize in it but we are a Psychopomp.
The professor nods absentmindedly at your words, quite fixated on the pillars. 'Hah! Are you quite seriously suggesting I'd let them take the glory of my discovery? Nonsense! Now, you don't need to revive me or anything of the sort. I'll manage perfectly well like this, I should think.'
He is rapidly solidifying; unless you can get his attention, he'll be turning into a ghost soon. Such spirits are simple reflections of who they were in life, defined by some driving purpose - some unfinished business, as they say. Though it would seem he is already quite fixated on this even now.
'Well, it's quite simple, really,' he continues. 'You simply make your way through the chamber in the right order. But! As you can see, there are thirteen of these pillars, and, erm, seven piles of rubble. The combinations are quite many, and should you take the wrong path... boom! I was certain it followed a rite of the Elysian Mysteries, but perhaps I made a mistake. Ah, well. I'll be at that door soon enough!'
You feel the field of arcane power permeating the chamber. With enough skill, you might be able to identify the correct path based on the connections between these ancient spells. That, or you could simply attempt to figure out the pattern logically - if you wish to solve the thing, in any case. It might help you with dealing with the stubborn old man. Of course... this is not something intended for Guides. Your aura might hide you from these spells, which would allow you to simply move to the doorway. This
is quite advanced magic, however.
If words and persuasion fail, you could also attempt to overpower him with your will. The consequences of failing that would be dangerous, though.
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I wrote this update before your post, Tomasque. You can still do that action (further elaborating how, if you like).