Arcane Carbine (Eldritch Hunt)

Trick Weapon (Carbine) 

Carbine: Martial Weapon, Ranged (60/120), 2d8+1Piercing Damage, Properties Ammunition, Loading, Range, Two-Handed.

This unique carbine bears to vertically mounted barrels. It only has a single hammer, and one of the barrels appears to be filled with a strange, purplish gem. The secondary barrel was obviously added later on. However it is finely made with a level of skill that rivals the masters. When attuned this weapon you gain +1 on attack and damage rolls. 

Trick Weapon

as an action you can grab the barrels and twist, swapping their places. When the gem filled barrel is on top it flares with arcane light on each shot. If you listen, closely you might even hear it humming as I’m in anticipation of the next shot. 

Untransformed 

as a reaction to being the target of an attack, you may fire at the aggressor. On hit the target takes damage as normal and their attack is wasted. You may use this ability after a successful attack but before the damage roll. Because of the weapon’s fine make, it suffers no disadvantage at long range. 

Transformed

In this state the weapon ignores the loading property. All attacks in this state produce a 15ft cone or line (player’s choice) from the barrel that deals force damage. Targets in the area of effect must make a DC 15 dexterity saving throw. On a failed save targets take 2d8 force damage. On a successful save targets take half as much damage. This attack does not benefit form bonus to attack and bonus to damage rolls. Additionally, you may cast Magic Missile and number of time equal to your proficiency bonus, regaining those uses after a short or long rest.

 

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.

Notes: Range, Two-Handed, Ammunition (Firearms), Burst Fire, Reload, Slow