From Guild Wars 2 Wiki
Toy Ballistae are turrets that can be created in Tixx's Toypocalypse. A Toy Ballista fires a powerful shot that affects a single target. It is limited by line of sight, so it is a good idea to create the ballista on a location with some elevation.
- Toypocalypse (80)
- Interacting with a Toy Ballista while holding Scraps will upgrade the turret to a Toy Superballista. This will restore its health as well as increase its range and power.