as part of the MQ, I was told to check out caste faallen.

what exactly am I supposed to be looking for?

just UESP'd it and realised the location is random.

I am looking for the brother of the prince of sentinel.

Apparently its a note I need to find.

I take it the note will be layed out on the floor in the way loot it?

talk about looking for a needle in a haystack.

Yes the note is somewhere in the dungeon. The 2D sprite is big enough to recognize it. It uses the same icons as notes and papers, which is a plain, open parchment.