Board Thread:Speculation House/@comment-198.82.111.80-20160315173800/@comment-32598036-20160412022838

If it eases your mind, the arm is in no way related to the Grimm. It's a more... supernatural force. Oh, WC-83, the arm doesn't possess Yang. At least, not yet.

Also, Ethan Merlot is an OC and he's the son of Merlot.