Bad Lantern

The Bad Lantern appears to be a standard brass lantern with glass sides and a single black candle inside and a handle on top. When the candle is lit, the lantern emanates a field of darkness in a 20 foot radius around the lantern, and dim light out another 20 feet. This darkness does not spread around corners, and is blocked by full cover.

The holder of the Bad Lantern can see through the darkness, but other creatures cannot. Darkvision does not allow a creature to see through this darkness. If any of the Lantern's darkness overlaps with an area of light created by a spell of 2nd level or lower, the spell that created the light is dispelled. The darkness moves with the Bad Lantern. 

The Bad Lantern does not require attunement. The candle inside the Bad Lantern can burn for a maximum of 8 hours total. Replacement candles may be purchased from a less-than-reputable arcane shop in the bad section of most cities, or from a temple consecrated to a deity of darkness or evil. See your DM for details.