Cannon

Inanimate Object. The cannon is an inanimate object and as such has the following properties:

• The cannon cannot recover from the prone condition without the help of other creatures. A mounted cannon (like one upon a battlement) may not be knocked prone.
• The cannon weighs 600 pounds and must be pulled by either 2 medium creatures or 1 large creature if it is not mounted, and if it is mounted it cannot be moved until unfastened from its position. It takes 10 minutes to mount or unfasten the cannon. It may be used either way.
• The cannon must have another creature use their action in order to perform one of its actions; it may not act on its own.

Siege Weapon. The cannon deals double damage to objects and structures. 

Reload. A creature within reach of the cannon may use their action to begin to load a cannon ball or load and ignite a giant firebomb that is also within reach of the creature to be fired from the cannon. It takes two reload actions to fully load the cannon.

Aim. A creature within reach of the cannon may use their action to change the space within range the cannon will fire at. The cannon will fire towards this space on all of its attacking actions unless it is aimed at a different space within range.

Cannonball. Ranged Weapon Attack: +6 to hit, range 120/480 ft., one target. Hit: 44 (8d10) bludgeoning damage. The target must make a DC 22 Strength saving throw or be knocked prone and pushed back 20 feet. The cannon must be fully loaded with a cannonball in order to use this action.

Giant Firebomb. Ranged Weapon Attack: +6 to hit, range 120/480 ft., one target and all creatures within 20 feet of that target. Hit: 22 (4d10) fire damage and 22 (4d10) force damage. Any creature within 20 feet of the main target must make a DC 22 Dexterity saving throw, taking 22 (4d10) fire damage and 11 (2d10) bludgeoning damage on a failed save or half as much on a successful save. The cannon must be fully loaded with a giant firebomb in order to use this action.