In the final battle of the series, many Ravenclaw students choose to stay and fight alongside the other houses against Voldemort and his forces. This shows their bravery and commitment to the greater good. Their participation, along with the revelation of the importance of Ravenclaw's diadem as a Horcrux , is crucial to the narrative. Ravenclaws, with their intelligence and wisdom, play a strategic role in the planning and execution of the battle, showcasing their bravery and commitment to fighting against dark forces.