Found it! Raven companion.
Very strange... instead of being in My Inventory like other companions, it shows up in My Rewards, press L3 and an Activate/Deactive button appears.
The raven flies arround a bit and then lands on either shoulder for a short rest, then flies some more.
**edit** The following day it finally appeared in the regular Inventory.
Edit: I have no idea why my original post has "Solved! Go to solution." This is the first time I've ever created a thread and I have no idea what happened. So just ignore that comment.
Okay, I feel stupid asking but, where's the mysterious libram at? I remember it was in the library before but the only interactive book I see here is the moulding manuscript.