Anti-Dragon mounted Ballistae

This massive magical ballista was designed specially for defending airships and kingdoms from the most powerful and dangerous of natural threats, the Dragon.

To fire this weapon you must spend one round per damage die loading it, after one round you will deal 1d20, after 2 you will deal 2d20, and so on, with a maximum of 5d20 damage with a +30 to all damage rolls.

Attacks with this weapon against a large or smaller creature have disadvantage

If the user chooses, the target of this weapon must make a DC 20 strength saving throw, or is attached to the weapon by a length of rope that cannot be severed by the target, this feature can only be used on a Huge or larger target

Notes: Damage: Piercing