Blue

Origin
The sword "Blue" escaped from the Rainbow Plane at North/South War II. It is one of several "colors", along with Red that have made appearances in our Realms.

Description
It poses as a 5' magic sword with various tassels hanging from it and a pentagonal gem at it's hilt. The sword travels from place to place on various creatures who are dumb enough to pick it up and bring it with them.

Effects
Blue kills it's wielder by sending a spike up the arm and through his or her heart. Magical resistance has not proven effective though Resist Death and Knightly Blows are theorized to be effective against it if immediately dropped.

The sword is magical and cleaves through armor without any difficulty. Be wary not to pick it up.

Source
http://library.cityofivory.org/598/Blue