A darach will channel their ability to harness the forces of nature, including their influence of animals in the name of obtaining and imbueing themselves with enhanced supernatural powers. Also, instead of committing self-sacrifice in the manner of more benevolent druids, a darach will commit murder, using human sacrifices to obtain newer additional types of supernatural powers from their victims' offering. Subsequently, they will typically use their new powers for carrying out their worldly passions and nefarious goals.
A darach's perversion of their traditional Druid capabilities is shown to not come without consequences. Animals can react to their supernatural prescence by behaving eratically, some species migrating out of their regular area and becoming suicidal. Also because of their actions being against the natural call of nature, a Darach's appearance is quite inhuman and repulsive.
Jennifer Blake, aka Julia Baccari, was the only known darach to appear in the series.
Afterwards, Julia swore revenge against Kali and Deucalion, abandoning her obligation to maintain balance and became a darach. She used her druid abilities to harness the ways of nature, including influencing animals to commit suicide and bestowing upon herself a multitude of additional supernatural powers. The consequence of this was her deformed appearance. Using her glamour ability, she disguised herself with a new identity. In Season 3, she took on the name of Jennifer Blake, a high school teacher and to obtain the power to destroy the Alpha pack, she planned to committ five sets of three human sacrifices.
A darach has all the original powers a druid is trained to use including herbalism, force of will and being attuned to natural forces including Telluride currents and being able to harness a Nemeton's power.
- Zoopathy: With her natural druid skills, Jennifer could influence animals to sacrifice themselves
- Extended lifespan & health: By harnessing a virgin's unintentional sacrifice, Julia's health and life span were extended and revitalised
- Glamour: Julia had the ability to look totally different than she actually appeared to be.
- Telepathy: Jennifer Blake levitated and rocketed several glass shards to kill Kali
- Mind control: With the aid of mistletoe or wolfsbane poisoning and her herbalism skills, Jennifer could control an entire recital
- Mental illusions: Jennifer could inflict visual and editorial illusions upon her victims
- Teleportation: The darach could teleport herself and others from one place to another as she teleported herself and her second Healer victim outside
- Enhanced attractiveness and allure: it is believed that by sacrificing virgins Jennifer could also attract people and appear harmless and deferring as seen when she easily seduced Derek and avoided detection by the Alphas
- Enhanced strength & speed & endurance: By sacrificing warriors, Jennifer displayed feats of supernatural strength, speed and reflexes that put her with the augmented alphas of the alpha pack
- Enhanced mental capacity: Jennifer implied that by sacrificing philosophers she would be granted more strategic planning and mental
- Enhanced healing: by sacrificing healers, Jennifer could heal from moderate injuries in seconds and survived a slashed throat, as well as heal others from seemingly irreparable injuries as well
Tapping into the laws of nature, and harnessing the power of the Nemeton, Jennifer called upon the sacrifices of animals, and throughout Season3A, ritualistic murders to imbue herself with an arsenal of powers - telekinesis, mind control, super-strength, healing power, psychic abilities and most prominently glamour.
- The first virgin sacrifice is Stiles's childhood friend Heather. It was her 17th birthday, and she was planning to lose her virginity to Stiles in the wine cellar when suddenly the wine bottles started exploding. She is abducted through the basement window, and all the destruction appears to have been a mirage.
- The second virgin sacrifice is a lifeguard, who Lydia found dead at the pool wearing a purity ring.
- The third Emily, who was on a date with her girlfriend Caitlin in the woods. They were going to have sex for the first time.
- The first soldier sacrifice is Kyle. He was ROTC and got caught after taking his dog to the Animal Clinic.
- The second soldier sacrifice is the band teacher, who was taken from the band practice room at school while he was playing the piano.
- The third soldier sacrifice is Mr. Harris, who was ex-military.
- The first of the sacrifices is the ER attending, unnamed, who never arrived for work. The attending was male. His body is found while Sheriff Stilinski is taking the report on the kidnappings. Aiden, Deucalion, and Chris Argent are present at the crime scene. He died of asphixation, though he was not strangled.
- The second is Dr. Hilyard, who was taken on her way to work to fill in for the ER attending. When her body is brought to the morgue Melissa McCall asks Sheriff Stilinski if she has ligature marks on her neck. When he says no, she shows him the ER attending's body and the deep cuts on his wrists. She believes he was hung by his wrists and eventually ran out of strength to pull himself up to breathe.
- The third is Alan Deaton. Deaton calls Scott as soon as the moths appear in his office, telling him that he's going to be taken and he needs Scott to find him. Deaton is suspended from the ceiling in a Beacon Hills First National bank vault and surrounded by a mountain ash circle.
- Deputy Tara Graeme was the first sacrifice. Before she was a cop, she used ot teach middle school. Scott sees her body on top of the high school's sign after Lydia calls them all because she ended up at the school when she was intending to go somewhere else.
- Mr. Westover, the history teacher, is the second sacrifice. He is taken out of the school in the middle of the day. Lydia finds herself outside his room and write a 2 in the five-fold knot drawing that appeared where his class notes had been. Allison, Isaac, and Chris find him while the Darach is still tying him up.
- The third sacrifice is an unnamed pianist at the memorial concert. She she plays, the piano wire breaks and slices her throat open.
- Sheriff Stilinski became the first guardian taken from the school the night of the recital when he came up Jennifer Blake attacking Lydia.
- The same night that Sheriff Stilinski was taken, Ms. Blake took Melissa McCall from the hospital, while Scott and his friends were dealing with the alpha pack.
- The following day, Chris Argent gave himself up to the darach, hoping that he would be able to free the others upon his arrival, but she took all of his hidden weapons while he was knocked out.