"This is a gun." Lucia pulled a flintlock. "It was used since the old age by pirates and assassins to kill mages and fighters, but as you might expect, the kingdoms quickly took that technology and made it a common weapon." She pointed at the wall.
"If it was a staff, then the rounds are its components. You can smack someone with an empty gun, but that isn't the extent of its power." BAM! She fired a shot at the wall, and the bullet stopped without even denting it. The walls of the schools were reinforced with magic strong enough to stop basic spells and siege weapons.
"And since I know not everyone has a talent for magic, there is a simple 0-tier spell that can teleport small objects for less than a meter distance. It's pretty useless, but…" BAM! BAM! BAM! BAM!
