One of the Yee Naaldlooshii, which are these werewolf like creatures that can communicate via telepathy. Some are quite eloquent, others can barely string sentences together.

Diniih has the inability to feel anything. Cannot feel emotion, touch, smell, taste, anything. Except one thing. Pain. Diniih constantly will constantly cause pain on his body to feel something. Diniih takes this as the only proof that he is in fact actually alive.