Mushroom murderer Erin Patterson will learn her fate in 13 days.
The 50-year-old triple killer's sentence date was set for September 8, at the end of an emotional plea hearing on Monday.
Patterson was found guilty by a jury of three murders and one attempted murder over the deaths of her estranged husband Simon's family, Don and Gail Patterson, 70, and Heather Wilkinson, 66.
She maintains her innocence, despite pleas from sole surviving lunch guest Ian Wilkinson to confess and repent.
Patterson's legal team accepted the offending for which she was convicted was "very grave".
"We make no argument the head sentence should be anything other than life imprisonment," her barrister Colin Mandy SC told the Supreme Court on Monday.
"The ultimate issue between the parties is whether a non-parole period should be fixed."
Prosecutors said Patterson, who has been in prison since November 2023, was not deserving of the court's mercy because her crime was "so cruel, so horrific".
"Your honour should reach the conclusion that, because of the seriousness of the offences here, it would be inappropriate to fix a non-parole period," prosecutor Jane Warren told Justice Christopher Beale.
Ms Warren asked the judge to make factual findings about Patterson's intention to kill.
"It is a case that demonstrates the highest level of planning and preparation, and upmost level of premeditation," she said.
Patterson subjected her victims to "slow and painful deaths" by using death cap mushrooms in the beef Wellingtons, she argued.
She claimed Patterson "had days" where she could have provided medical staff with vital information on her victims, to provide life-saving treatment in hospital before they died.
"Even if she told Simon Patterson she'd used wild mushrooms, that would have ... completely changed the treatment," Ms Warren said.
She alleged Patterson's "elaborate attempt" to cover up her crimes, including disposing of a dehydrator and lying about becoming unwell, had aggravated the offending.
But Mr Mandy argued there could not be any finding that her acts were deliberate nor her intention was to kill and cited a lack of clear evidence on where and how the death cap mushrooms were sourced.
Justice Beale noted the crime's impact on two families, the Wilkinsons and Pattersons, was "like a tsunami" which had affected four generations.
Mr Wilkinson became emotional in court as he described the "sorrow and grief" Patterson had brought to his family.
The church pastor offered an olive branch of forgiveness to Patterson for trying to kill him at the July 2023 lunch.
"I encourage Erin to receive my offer of forgiveness for those harms done to me with full confession and repentance," he said.
"I bear her no ill will, my prayer for her is that she will use her time in jail more wisely to become a better person.
"I am no longer Erin Patterson's victim, and she has become the victim of my kindness."
