Wondrous item, very rare

History: This gadget was invented by a brilliant but eccentric dwarven engineer named Rurik Moltencore. It is a handheld device capable of firing concentrated blasts of molten metal. Though difficult to control, it is devastating in the hands of a skilled marksman. The cannon was lost when Rurik disappeared during an experimental test.

Abilities:

• Molten Blast: As an action, you can fire a blast of molten metal in a 60-foot line that is 5 feet wide. Each creature in the line must make a DC 15 Dexterity saving throw, taking 8d6 fire damage on a failed save, or half as much on a successful one. This ability recharges after a short or long rest.

• Overheat: If the cannon is used twice in a single combat, the wielder must succeed on a DC 15 Constitution saving throw or take 4d6 fire damage.