The Asura Sect knew they couldn't win a battle against the Great Demon Sect, but they believed they could at least kill an Elder and a few disciples with the help of their Formations.
Their goal wasn't to defeat the entire Great Demon Sect. It was simply to take down the Elder who was attacking them.
If they were lucky, they might even be able to seize the Battleship of the Demon Sect, which could help them escape after the battle.
This would allow them to carry all the Sect's precious items and bring many important disciples on the Battleship.
After this battle, they would no longer have a place in the Eastern Continent, so they planned to flee to another continent.
They could trade the Demon Sect's Battleship with the Overlords of other continents in exchange for protection. The Southern Continent, which already despised the Great Demon Sect, seemed like the perfect place.