MAJOR Spoilers for the Teen Wolf series finale ahead
Now that the Teen Wolf season 6 and series finale has aired, we break down the ending to Scott McCall's (Tyler Posey) story as an alpha werewolf in Beacon Hills. The series, created by Jeff Davis (Criminal Minds), debuted on MTV in 2011 and introduced Scott McCall, a sophomore in high school who is bitten by an alpha and turned into a werewolf. Along with his friends Stiles Stilinski (Dylan O'Brien), Lydia Martin (Holland Roden), and Allison Argent (Crystal Reed), Scott acclimated to life as a werewolf and eventually evolved into an alpha himself, leading a pack of all kinds of supernatural creatures in Beacon Hills.
Over six seasons Teen Wolf has undergone a great many cast changes, between additions and departures of series regulars and recurring stars. Scott and his friends have also faced a number of supernatural and human villains over the years, like the Ghost Riders of the Wild Hunt, the Durach, the Nogitsune, and more recently the hunters led by Gerard Argent (Michael Hogan) and Tamora Monroe (Sibongile Mlambo), whose anger and fear have been exacerbated by the Anuk-Ite. In the Teen Wolf series finale, Scott is joined by friends and allies - including Derek Hale (Tyler Hoechlin), Jackson Whittemore (Colton Haynes), and Ethan (Charlie Carver) - in a final fight against Gerard and the Anuk-Ite.
Related: Teen Wolf Final Episodes Trailer
In the Teen Wolf series finale, 'The Wolves of War', Scott and his friends race to figure out a way to destroy the Anuk-Ite because they believe it will undermine Monroe's army. Since the Anuk-Ite is heightening the fear and anger of everyone in Beacon Hills, it's driving humans to hate supernatural creatures (i.e. anything that's "other") and they've joined up with Monroe. So, in order to smartly fight the all-out war started by Gerard and Monroe, Scott looks to eliminate their major advantage, that being the Anuk-Ite. Meanwhile, Scott's allies work to take the weapons away from those Gerard armed. But how exactly does Scott defeat a supernatural creature that is essentially fear itself?
Scott's Final Battle Against the Anuk-Ite
Despite tracking the Anuk-Ite down to Beacon Hills High School along with a whole host of his allies - including Malia, Derek, Peter, Jackson, and Ethan - Scott is left to fight the creature by himself after each one of his friends falls victim to their worst fears. Derek's fear is, of course, a callback to Jennifer Blake/the Durach from season 3A. Similarly, the Anuk-Ite takes the form of a number of previous Teen Wolf villains in order to terrorize Scott. The most heart-wrenching, and the first form the Anuk-Ite takes for Scott, is that of Stiles when he was possessed by the Nogitsune, a reference to the main antagonist of season 3B. Other forms the Anuk-Ite takes for Scott is of the bandaged Nogitsune, the Berserkers from season 4, and the Dread Doctors from season 5.
After his brief training session with Deucalion (Gideon Emery) in the previous episode, Scott knew it was only a matter of time before he accidentally opened his eyes. To prevent that from happening, Scott gouges his eyes out. He also declares he isn't afraid of the Anuk-Ite. Both actions presumably enable Scott to fight the creature without fear of being turned to stone. However, while Scott is now able to fight the Anuk-Ite, he's still unable to defeat the supernatural creature, who had previously only been trapped by those who beat it before. In true Teen Wolf fashion, the answer to how Scott can possibly defeat an unbeatable creature comes at the last moment as a sort of hail mary. While Scott fights the Anuk-Ite in the high school library, Chris Argent (JR Bourne) is confronting Gerard and leads the human villain to the realization that Scott presumably came to off screen.
Since the Anuk-Ite became a shapeshifter creature when its two sides joined in the previous episode, it follows the same rules of nature as any other supernatural creature. As Scott explains to the Anuk-Ite, supernatural creatures "have lines we can't cross." The Anuk-Ite's weakness is Mountain Ash - the substance that has been a key part of Teen Wolf's mythology since the show's early days. In fact, Gerard's moment of realization is no doubt a callback to the season 2 finale, in which Scott poisoned him with Mountain Ash and Gerard exclaimed (in a hilariously over the top fashion), "Mountain ash!"
In the library, Stiles bursts into the library and doses the Anuk-Ite with enough Mountain Ash that it turns to stone and shatters. As a result, those who had been turned to stone by the Anuk-Ite are freed and are able to fight off Monroe's soldiers.
After the Anuk-It is defeated, Scott is unable to heal himself and is in danger of losing his eyesight permanently. However, Malia kisses Scott at the urging of Lydia, and he's able to trigger his healing - in another callback to a previous episode. Teen Wolf creator Jeff Davis explained this moment in a post-mortem interview with TVLine:
Scott says, “I’m trying, I can’t focus.” Lydia knows that Scott needs to calm his heartbeat, let the adrenaline go and focus on healing. The moment she was able to calm someone was with a kiss; she’s remembering the kiss that stopped Stiles’ panic attack the first time they kissed. That’s all Malia’s doing, helping him focus.
Of course, that's not where Scott McCall's story ends.