The Fire Storm

Ammunition (60/180), Heavy, Loading, Special, Two-Handed
On Hit: 2d8 radiant damage plus 1d10 fire damage plus 1d10 lightning damage, and all creatures within 10 feet of the target must make a DC 19 Dexterity saving throw, taking 4d6 fire or lightning damage (you choose when firing the shot) on a failed save, or half as much on a successful one.
Ammo: Energy Cell x2 per shot
"A supremely powerful and hi-tech weapon crafted with the elemental essence of a living storm and a goddess of fire."

Random Properties. The Fire Storm has the following random properties upon attuning to it:
While attuned to the artifact, you gain proficiency in Athletics.
While attuned to the artifact, you can use an action to cast Pulse Wave or Elemental Bane from it (spell save DC 19). After you cast one of the spells, roll a d6. On a roll of 1-5, you can't cast that spell again until the next dawn.
While attuned to the artifact, you are deafened when you are more than 10 feet away from it.


Special
The Fire Storm can be attuned to up to two times by a single creature. A creature must attune to the weapon at least once in order to fire it. If a creature attunes to the Fire Storm twice, they are able to use the following additional properties:
While attuned to the Fire Storm, you have resistance to fire and lightning damage.
Overheat (Recharge 6). When using the Fire Storm, you can activate its Overheat feature to cause all damage done by the Fire Storm this turn to ignore a creature's resistance to that damage, and treat a creature's immunity to that damage as a resistance instead.
Devastator Blast (Recharges on a Long Rest). As an action while holding the Fire Storm, you can use the weapon to cast either Fireball at 9th level or Lightning Bolt at 9th level (spell save DC 19).

Destroying the Fire Storm. The Fire Storm can only be destroyed by hitting the weapon with one of its own shots after the weapon has used its Overheat property, causing the weapon to overheat itself and resulting in an explosion. Any creature within 30 feet of the Fire Storm when it explodes must make a DC 19 Dexterity saving throw, taking 14d6 fire damage and 14d6 lightning damage on a failed save, or half as much on a successful one. Damage done by this explosion ignores a creature's resistance to that damage, and treats a creature's immunity to that damage as a resistance instead.
Rarity
Futuristic Firearm (Laser Cannon), Artifact (Requires Attunement)

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