This item looks like a basic blunderbuss crossed with a steampunk nightmare. On either side of the barrel are two blue and two orange gemstones.
When fired, the gun casts Arcane Gate (6 level spell: you create two linked circular portals 10 feet in diameter, one within 10 feet of you and the other within 500 feet of you. The portals are two-dimensional glowing rings (one blue entry portal and one orange exit portal), hovering inches from the ground and perpendicular to it at the points you choose. A ring is visible only from one side (your choice), which is the side that functions as a portal. Any creature or object entering the portal exits from the other portal as if the two were adjacent to each other; passing through a portal from the non-portal side has no effect. On your turn, you can rotate the rings as a bonus action so that the active side faces in a different direction; PHB 214).
Normally, the spell is a Concentration spell and lasts for up to 10 minutes. When fired by the gun, the portals last for up to 10 minutes, or either until the gunner cancels them or the gun is fired again and resets the portals.
The gun contains 4 charges, and regains all spent charges daily at dawn. Firing the gun spends 1 charge to cast the spell in its entirety (i.e. both the entry and exit portals). The gun may be fired either as an action or as a reaction. If fired as a reaction, the gunner must make a DC 10 DEX saving throw to aim the weapon. Failure may mean the portals aren’t placed where you want them.
When activated, the gun turns on with a series of musical chimes that mimic the Aperture Labs Coordinator saying "Now you're thinking with Portals."
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