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I apologize if this has been posted before but their is a bug with the Quiver +1 arrows which you get in the black pits (you can buy it)
It should provide unlimited +1 arrows. When equipped the damage just says 1d6 without the +1 factored in, so I believe it is acting like an unlimited quiver of regular arrows. When I actually equip magical +1 arrows the damage reads at 1d6+1.