These ravens are located at Thamur’s Corpse and there are 2 in total.
Raven 1
As soon as you dock the boat at Thamur’s Corpse, look up past to the Mystic Gateway to find the raven perched on a stone ledge.
Raven 2
Head into the hidden chamber at Thamur’s Corpse and follow the path to make your way to the room holding the Valkyrie. The raven will be located on a branch on the right side of the tree.
