Having already all but qualified after defeating both the Sydney Roosters and Dragons in the opening two rounds, the Broncos ran in six tries to two in dominant win at AAMI Park.

The result bumped the Warriors down to last, meaning the Broncos will meet the winner of Saturday's clash between the Dragons and Roosters in next Sunday's grand final.

After they led 16-10 at half-time, the Broncos ran in three unanswered tries in the second half to capitalise on a wealth of possession.

Hooker Brittany Brealey was the star, setting up two tries and scoring one herself with a 40-metre dash out of dummy-half to get the Broncos firing after the break.

Winger Julia Robinson also bagged a double, the first off a wonderful set play from a scrum where Brisbane caught the Warriors short down the blindside.

"It's one we'd been practising, but you've got to take your opportunities," Broncos halfback Ali Brigginshaw said.

"They were talking that we were going to do it, but they didn't defend it."

The Broncos are also hopeful a knee injury suffered by Kiwi Fern second-rower Maitua Feterika's isn't too serious after she was carried off the field.

Broncos coach Paul Dyer then pulled the majority of his spine from the field as a precaution before next week.

"She's (Feterika) going to be okay. It gave her a little bit of a fright but I don't think it's anywhere near as bad as they first thought," Dyer said.

"My mindset went straight away to trying to make sure our spine was off the field. If you lose some quality players it makes the job more difficult next week."

Australian Associated Press