Forget knights in shining armour and meet the warriors who do battle in cardboard boxes.
If you haven't heard of Boxwars before, prepare to be amused and possibly slightly confused.
It's a network of men and women who spend months building armour suits out of cardboard and then destroy them in mock battles.
Our city will be under siege on Friday night as part of Sydney Festival's Parra Opening Party.
Cardboard clad warriors will parade their intricate creations down Church Street before they take to the battlefield in Prince Alfred Park.
Box Wars founder, Supreme Overlord Commander Ross Koger, said the more extravagant the suits, the more fun they were to destroy.
"We try to build the most elaborate and creative suits we possibly can to make it the most pointless exercise we can possibly make it," Mr Koger said.
There are three laws all warriors must follow on the battlefield: use commonsense, don't do something to someone that you wouldn't want done to you, and leave the competitiveness for the creativity.
"It's all about fun. The competitiveness is off in the field, it's in the construction," he said.
Boxwars parade and battle will take place on Friday from 6pm to 8.30pm.