Stalker's Choice (3.5e Equipment)
From D&D Wiki
A blade almost as dark as the night sky, the Stalker's Choice is the ideal weapon for characters that make their home in the shadows. A highly unusual weapon, it forms an almost symbiotic connection with the wielder, allowing them to always be able to clearly see their weapon. Also, because it possesses an unnatural affinity to shadows, if the wielder is in any area that is dimly lit, they gain a +2 bonus to both attack and damage unless the creature has low-light vision or darkvision. If in total darkness, Stalker's Choice grants a +2 bonus against any creature without darkvision.
Also, being just slightly larger than a dagger, it gains a +4 to slight of hand checks in dim or no light, but the usual +2 in daylight.