A scorned woman's wrath seemed to "bubble and fester" for months after she was evicted from a share house, a judge has said.
It culminated with Tsai-Wei Hung visiting her landlord's home and setting the entrance on fire while seven people including two children and an elderly woman were inside.
"Go to hell," Hung, dubbed the "housemate from hell" by her victims, yelled in Mandarin before igniting the blaze.
Hung, 33, was jailed for up to six years and two months in Melbourne's County Court on Wednesday after pleading guilty to four arsons, extortion and conduct endangering persons.
Judge Carolene Gwynn described her offending as an "extraordinary, volatile and frankly dangerous" response to being evicted and asked to leave her former share house.
"Not only was your animosity towards your victims clearly ongoing, but your wrath seemed to bubble and fester," she told Hung.
"You pursued a terrifying vendetta, affecting numerous victims, in a premeditated course of conduct, involving arson, dangerous driving, criminal damage, extortion and of course the charges relating to your reckless conduct."
Hung became emotional during the sentence and it had to be briefly adjourned to allow her time to calm down.
Her three-month spree began the day she was evicted, on March 11 2024, when she hurled eggs at a garage door.
Hung then accelerated towards her former housemate Chung-Ting Tuan and landlord Lin Zhang at speed, stopping sharply one metre away from them.
She drove into the garage roller door, damaging it and three vehicles parked inside, fleeing before police arrived.
Hung returned the next day and damaged the vehicles inside the garage further, then went to police and claimed "she just wanted to scare them".
Three months later, on June 10, she returned to her former Clyde North home and set the front door on fire before setting two cars alight.
She tried to extort her victims by demanding her landlord pay her $30,000, and warning Mr Zhang and his family "be careful or they will have the same experience as me, or even lose more than that".
His Clyde North tenants were afraid and arranged to stay with Mr Zhang and his family on June 11.
There were seven people at Mr Zhang's Berwick home - including his two kids and their grandmother - when Hung visited early on June 12.
She poured accelerant outside the front entry to the home and used matches to set it alight. Luckily no one was injured and the fire went out itself on the concrete.
Judge Gwynn said she was concerned about Hung's actions and reactions in the three-month period, combined with her limited remorse.
"Your capacity to deal with conflict and or stress in the future is unknown," she said, as she sentenced Hung.
Hung has already served one year and seven months of her sentence, and will have to spend four years behind bars before she is eligible for parole.
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