You see a crystalline arrow.
It can only be wielded properly by players of level 90 or higher.
It weighs 0.75 oz.


They are a good replacement for Assassin Stars, since they cost 20 gp per shot, compared to 33 gp for Assassin Stars on average. You will also miss less often, and you'll have the extra attack value and extended range of you bow. The only drawback being that you cannot use a shield.
It looks the same as a Crystalline Arrow Earth, a Crystalline Arrow Energy, a Crystalline Arrow Fire and a Crystalline Arrow Ice.

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15 of them can be obtained from Gnomish Supply Packages.
Spoiler ends here.