A kobold cannon is a paper cannon that launches a projectile in the form of a dragon's head at a point within range. Kobold cannons come in 5 different damage types: Acid, Lightning, Fire, Poison or Cold.

Upon use roll a d6, on a 1 the cannon backfires and explodes on its current location.

Kobold Cannon. Ranged Weapon Attack:  range (100ft) a grinning dragon's head streaks towards a point within range causing an explosion. Each creature in a 10-foot-radius sphere centered on that point must make a DC13 Dexterity saving throw. A target takes 6d6 of the kobold cannon's damage type on failed save, or half as much on a successful one. The damage spreads around corners.