A collection of knives, a garrotte and a notebook containing a list of torture methods were among the dozens of items seized from the home of two women accused of murdering a teenager with autism, WA's Supreme Court has been told.
The items were found during a search of the house where Jemma Victoria Lilley, 26, and Trudi Clare Lenon, 43, are alleged to have murdered 18-year-old Aaron Pajich in June last year.
The teenager was last seen at the Rockingham Shopping Centre getting into a car with the two women, and his body was found eight days later in the backyard of their Orelia home, buried under tiles and a slab of concrete.
He had been stabbed in the chest and neck and also had an injury consistent with being garrotted.
The two women are now on trial accused of murder, but both deny the charge.
Prosecutors allege Mr Pajich was lured to the house by Ms Lenon so her friend, Ms Lilley, who had written a fictional book about a serial killer, could experience the "euphoria and exhilaration" of taking someone's life.
It's alleged Ms Lilley was "obsessed" with knives, and a police officer testified a number of them were found during a search of her house. This included a hunting knife, a meat cleaver, military and machete-style knives and butcher's and surgeon's knives.
A garrotte was also seized, and was described in court by a police officer as "having two blue plastic handles on each end, secured onto a reasonably stiff metal wire link."
The officer also revealed details of a notebook found in the house, which contained five handwritten pages of torture methods such as branding, castration, Chinese water torture, foot roasting, genital mutilation, force feeding and knee capping.
Later, photographs were shown to the court of Ms Lilley after her arrest.
The police officer who took the pictures confirmed under questioning the accused woman had a tattoo of the character Freddy Krueger on her leg, as well as a tattoo of what was described as a "devil-type animal figure" on her arm.
Ms Lilley maintains she was not involved in any way in Mr Pajich's death or his burial, while Ms Lenon says she only helped clean up the scene after the teenager was killed by Ms Lilley.
The trial is set down for five weeks.