With pressure coming down from Black Claw, Renard claims that Nick killed Conrad and gives his officers a shoot-to-kill order on the Grimm. Meanwhile, Eve discovers that she can't woge, and Monroe and Rosalee consider their baby's future.
Nick manages to escape the police but is forced to make a deal with Renard. Meanwhile, the others try to decipher the cloth while Monroe babysits Diana.
In a desperate ploy to undermine Renard, Nick has Eve cast a spell to transform him into the captain. Meanwhile, Diana reveals further powers, and Renard obtains a new ally that he can't afford to lose.
Back at work, Nick, Hank and Wu investigate a baby abduction tied to an ancient Wesen legend of El Cuegle, which steals and eats babies. Meanwhile, Adalind takes Diana to stay with Renard, while Eve examines the stick.
After a hotel guest kills a man on the street, Nick and Hank investigate discover a series of bizarre murders and suicides at the same hotel. Meanwhile, Eve and Rosalee try to work out the meaning of the symbols,and Renard gets a warning about a visitor.
Adalind leaves Diana with Renard while she and the others go to a hotel to celebrate Monroe's birthday. While Diana has a playdate with a new friend, Nick and the others get caught up in a twisted revenge scheme.
When a scientist is killed in her laboratory, Hank and Wu investigate and discover that a strange incident ties together the dead woman with three of her colleagues. Meanwhile, the black-skulled creature attacks Eve, and Nick stands guard over her as she recovers in the hospital.
Nick, Hank and Wu are called to the scene of the crime where a man claims his friend was consumed by a tree-like figure. Meanwhile, after the gang learns of Eve's disturbing mirror encounter, everyone takes extra precautions. Elsewhere, Capt. Renard searches for answers to what Diana was drawing.
After a series of brutal and deadly attacks, Nick and Hank find an unlikely lead in a local nursing home. Meanwhile, Eve goes to Adalind to get answers that only a Hexenbiest can provide. Elsewhere, Capt. Renard confronts Nick about the mysterious symbols and tries to strike a deal.
Nick use the Stick to pass through the mirror, but discovers that he and Eve are trapped on the other side. Meanwhile, the others bring Renard in and Dasha warns them that they are facing the fulfillment of ancient prophecy.
The prophecy that was uncovered comes to pass when a dark force arrives in Portland with its eyes set on Diana. In an effort to protect her, Nick, along with Capt. Renard and Adalind, returns to the scene of his first investigation as a Grimm. Back at the Spice Shop, Monroe, Eve and Rosalee make a discovery that uncovers the origins of the mysterious stick. Meanwhile, Hank and Wu are called to a crime scene that is connected to the gang's greatest threat.
Nick faces off against Zerstorer in final battle, and the devil-wesen gives him an unthinkable choice: hand over the stick or let his friends die. However, Nick receives help from two unexpected allies.
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