S6, E12: The prophecy that was uncovered comes to pass when a dark force arrives in Portland with its eyes set on Diana (guest star Hannah R. Loyd). In an effort to protect her, Nick (David Giuntoli), along with Capt. Renard (Sasha Roiz) and Adalind (Claire Coffee), returns to the scene of his first investigation as a Grimm. Back at the Spice Shop, Monroe (Silas Weir Mitchell), Eve (Bitsie Tulloch) and Rosalee (Bree Turner) make a discovery that uncovers the origins of the mysterious stick. Meanwhile, Hank (Russell Hornsby) and Wu (Reggie Lee) are called to a crime scene that is connected to the gang's greatest threat.