The sword of Crota was weilded by the shadow of crota when eris and her team attempted to kill him, but when his body died his soul was saved. Its likley that the shadow of crota is a vessel that crotas soul can inhabit. Its is said in the grimore cards that the older more powerful hive have ascended beyond conventional physical forms. Thats why we have to go into hive hell and find crotas soul down their and destroy him with a weapon from that same realm(the sword). So basicly the swords are all common place weapons to the hive that are created from the dark wills of the hive leaders. So the sword crota weilds is made up of dark energies that he can give solid form in his world. Were as the "sword of crota" is a weapon made so that the physical embodiment of crota would have a weapon of power to use in our world.
English
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Thank you for that
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^ this