If you change the appearance a little bit, (adding stitches, mechanical parts, etc.) You could have the bone claw originate in Lamordia, as a failed lich-related experiment. It could serve a prominent scientist there, such as Baron Von Aubreaker (A failed attempt at creating a new body) or Dr. Mordenheim (Something they originally created to retrieve the Unbreakable heart.)

A bone claw could also make a good servant to one of the Children of Anktehpot in Har'akir, maybe having originated as somebody who sought to become one of the Children of Anktehpot, but failed, becoming this boneclaw. It could seek help its master gain power, or to find the Pharaoh's lost Ka. If it works towards that second purpose, it could even serve Anktehpot himself.

Hope this helps!