A Ballista is a massive crossbow that fires heavy bolts. Loading a Ballista requires the Utilize action, and aiming it requires another Utilize action. Then a crew member can take the Ballista Bolt action.
Aktionen
Ballista Bolt (Requires Load and Aim)
Ranged Attack Roll:+6, range 120/480 ft. Hit: 16 (3d10) Piercing damage.