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Mountain Ash is a naturally occuring wood that serves as a natural replent and barrier to supernatural creatures within the Teen Wolf universe.

Teen Wolf Creator Jeff Davis has called Mountain Ash “magic”. It appears to focus natural energy into physical barriers against supernatural beings. Large quantities of the wood is shown to make werewolves and other creatures feel lethargic and sick.

In the real world, Mountain Ash is Sorbus scopulina, a small to medium-sized deciduous tree common in Northern California.

The North American tree and its European cousin Sorbus aucparia, also known as Rowan, are woven throughout the folklore of many regions as a ward against evil beings.

Mythical Properties[]

Within the mythology of MTV’s Teen Wolf, Mountain Ash is mainly used by Druids. It can focus energy into physical barriers that block werewolves and other supernatural creatures. If a sufficient amount is built into the walls of a building, the material will calm and even sicken any supernaturals housed within.

VIDEO: How Hellhounds Beat Mountain Ash

VIDEO: How Did Scott Beat Mountain Ash?

Mountain Ash Effect[]

On two occasions, characters were able to form a perfect circle of ash around themselves by simply throwing the ash into the air (Alpha Pact,Lunar Ellipse). At other times ash seemed to move on its own accord to form a straight line and create a barrier in a doorway or other opening between two solid pieces of the Mountain Ash wood (Silverfinger, Time of Death).

These scenes show that, under proper conditions, the ash material can shift around on its own in order to connect to itself and form a barrier.

Examples[]

Druids Ms. Morrell and Jennifer Blake throw down circles of Mountain Ash dust to create a personal shield.
Peter Hale could not pass while a balustrade made of the wood was down, completing the circle of Mountain Ash built into the Vet Clinic in Formality.
Isaac and Erica could not cross a circle of Mountain Ash powder in Raving.
Capsules filled with Mountain Ash powder and ingested by Gerard cause him to violently reject a werewolf bite in Master Plan. He was continuously spat out black goo until he ingests yellow wolfsbane in Damnatio Memoriae.
Dr. Deaton says his animal clinic is lined with Mountain Ash "making it difficult for someone like Scott to cause me any trouble."
Sometime after Lunar Ellipse, Deaton installed Mountain Ash baseboards throughout the McCall home. Spreading Mountain Ash along front door jam completes the circle and (mostly) protects those inside from supernatural creatures.
Lorraine Martin's boathouse is apparently made of Mountain Ash. Spreading ash along the opening to the dock completed the circuit in Time of Death.
The supernatural lockup at Eichen House, the cells and a section of hallways are lined with Mountain Ash to prevent creatures from getting in or out. (Smoke & Mirrors, A Novel Approach)
In The Wolves of War, Scott and Stiles use mountain ash to trap the Anuk-Ite after it becomes part shapeshifter.

Exceptions[]

With great effort, Scott McCall was able to cross a Mountain Ash barrier (Lunar Ellipse). He later mentioned that the effort almost killed him (Dreamcatchers).
Peter Hale, and later Deucalion, showed that supernatural being can still throw items through a Mountain Ash barrier.
Several Oni, with great effort, were able to break through the barrier around the McCall home. The same applies to Ghost Riders as seen in Sundowning.
Tracy and the other Chimera are able to cross Mountain Ash because the rules don't apply to the Dread Doctors creations because they are not truly supernatural.
Deputy Parrish is able to burn through a Mountain Ash barrier as a Hellhound. Doing so burns the Mountain Ash and effectively breaks the connection and destroys the barrier.
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