Heavy Cannon (5e Equipment)

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Heavy cannon

Martial Ranged Weapons
Weapon Cost Damage Weight Properties
Heavy cannon 300 gp 2d8 bludgeoning 40 lb Ammunition (range 50/150), heavy, reload(1), two-handed

One of the oldest types of firearms, the heavy cannon is a large brass barrel with a blast chamber to internalize the explosive force required to ignite a light cannonball. Similar to the hand cannon, it requires direct manual external ignition through a touch hole without any form of firing mechanism. However, while it packs a much larger payload than an ordinary handheld firearm, its sheer weight makes it quite unwieldy to all but the strongest of users.

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This weapon uses small cannonballs as ammunition.

Heavy Impact

Add both your strength and your proficiency bonus to the damage roll upon impact with a target creature.

When the target creature is hit, it must make a Strength(Athletics) saving roll with a DC of (7 + your proficiency bonus). On a failed roll, the target creature is:

  • (If Medium or Large) Knocked back 5 feet. On a critical failure, it is also knocked prone.
  • (If Small or Tiny) Knocked back 10 feet and knocked prone.


The sheer force of the weapon and its massive backblast makes it awkward to fire. Every time the heavy cannon is fired, make a Strength(Athletics) check with a DC of (13 - your Strength modifier). On a failed save, your character is knocked prone after firing.

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