This category pertains to the "Monsters" launched by certain mobs (usually Mages) at the player.
“Spores are hostile projectiles spawned by Plantera. They can be avoided by being hit, or shot...Spore
“Water Spheres are projectiles launched by Dark Casters. They have 1 HP and can be destroyed with...Water Sphere
“Fungi Spores are a projectile fired from the Giant Fungi Bulb, and are its main attack aside...Fungi Spore