Mingun’s Artillery Gauntlet

This ornate gauntlet, crafted from unknown metals and inlaid with powerful runes, allows the wearer to channel destructive energy similar to that of the Mingun Dragon. While wearing this gauntlet, you can use a bonus action to create a missile of arcane energy and launch it at a target within 120 feet. This attack is treated as a ranged weapon attack with a +8 bonus to hit and deals 3d8 force damage on a hit. You can use this ability a number of times equal to your proficiency bonus, regaining all expended uses after a long rest. In addition, while wearing this gauntlet, you have advantage on saving throws against being frightened, and you can cast the spell 'Thunderwave' as a 2nd-level spell once per long rest without expending a spell slot. Lastly, the gauntlet has a unique ability: during a short rest, you can infuse it with any non-magical ranged weapon you are carrying. When you make your next attack with that weapon, it deals an extra 1d8 force damage.