This Large cannon is imbued with magic. It requires no ammunition and doesn’t need to be loaded. It takes one action to aim the cannon and one action to fire it. After the cannon has fired, it must recharge for 5 minutes before it can be fired again.
Lightning Shot. The cannon shoots a ball of lightning to a point you can see within 1,200 feet of the cannon. The lightning then expands to form a 20-foot-radius sphere centered on that point. Each creature in that area must make a DC 15 Dexterity saving throw, taking 33 (6d10) lightning damage on a failed save, or half as much damage on a successful one. Creatures wearing metal armor have disadvantage on the save.
It’s up to you to decide whether a character has proficiency with a firearm. Characters in most D&D worlds wouldn’t have such proficiency. During their downtime, characters can use the training rules in the Player’s Handbook to acquire proficiency, assuming that they have enough ammunition to keep the weapons working while mastering their use.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Push. If you hit a creature with this weapon, you can push the creature up to 10 feet straight away from yourself if it is Large or smaller.
Notes: Range, Two-Handed, Ammunition (Firearms), Reload, Push
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