Apologies if I got the spelling wrong, but by Jaimdain, I mean the guy who opens the seal to dragon Orobas. After discovering that Orobas is dead, I run back to him but he doesn't trigger the end quest dialog. The conversation offers no new dialogs. Is this a bug or do I need to do something more?
go back to high hall, go to the house of the guy who give you the drug at the first place. mindread him, take the key under the pillow, open the basement door to go to his secret garden. mine the drug from the plant. That the subquest would only consider done at this point.
now go back to this guy. the dialog to report Orobas death will now open for you.
one end of the key should have stuck out of the pillow.
so jump on the bed and you should be able to reach it easily. if it does not stick out , go outside and mindread the man. many of these items only turn up after you have mindread the owner.
I you cannot get the key on the bed, stand on the bed, move the mouse around. If that position does not let it get you, move a bit, then move the mouse again and you should be able to find the position where you can pick the key...