Yesterday morning the property was cordoned off, with a tarpaulin covering the attack area.
An armed police officer remained on guard at the entrance as a scene examination team worked the site.
Family members believe an axe was involved, but Detective Sergeant Scott Miller said police have recovered "a number" of possible weapons at the scene.
"We can confirm it was a heavy, solid weapon."
Persons at the property have been co-operative, he said.
As of yesterday afternoon they were still in pursuit of a suspect, who was known to police, with six detectives working on the case.
"The injuries were serious and life-threatening; the victim is lucky, but not out of danger," said Mr Miller.
Benjamin's younger brother Dylan, who was in Mauriceville at the time of the attack, spoke to the Times-Age before heading to Wellington to be with his brother.
He said doctors told him Benjamin's injuries had been "critical", with a fractured skull and lungs filling with vomit.
He cannot figure out why someone would injure his brother, who was more "a man of words" than into fighting.
"He's not going to out of his way to look for a fight."
He had been told the attack happened shortly after an altercation at the party, which he described as a "social get-together".
"All I know is, he was walking his dog to the car when he [the attacker] jumped out of the bushes.
"He axed him in the side of the head, then dropped it and ran off."
He said Benjamin went into convulsions, with doctors telling him his left lung filled with vomit.
Dylan said Benjamin was training up to compete at the Golden Shears this year and as brothers they did "everything" together.
Neighbours told the Times-Age the house needed a "good shake-up" because of the number of people in and out of the residence.
One neighbour, who did not want to be named, said he constantly saw different cars going to the property.
"A lot of people go in there."
Life Flight communications manager Sebastian Grodd said the air ambulance is used to transport "critically ill" patients and is like a "flying intensive care ward", carrying specialist flight nurses and a doctor.
Mr Grodd said there was less vibration in the air ambulance than in the rescue helicopter.
"They each have different benefits, an air ambulance is pressurised, it's also more spacious for a bigger medical team.
