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There is a Legacy version here.

PFS StandardGloom BladeItem 9

Magical 
Source GM Core pg. 242
Price 700 gp
Usage held in 1 hand; Bulk L
Base Weapon Shortsword
As black as coal, this blade grows more potent in darkness. While in bright light, it functions as a +1 shortsword and doesn't appear to radiate a magic aura to detect magic or similar spells unless the spells are 4th rank or higher.
In dim light or darkness, the gloom blade becomes a +2 striking shortsword. Whenever you use the gloom blade to attack a creature you're undetected by, you deal 1d6 additional precision damage.
To upgrade the gloom blade's fundamental runes, start with the base +1 shortsword, but if you improve it beyond a +2 striking shortsword, the runes apply in dim light or darkness as well.