Also the description of the sword says:
[b][quote]WIth your own hands you forged the mighty Raze-Lighter (...)[/quote][/b]
[b]I bet this is gonna be the exotic you will need to find 50 parts of [u]or this is the "old" and "forgotten" exotic that Eris will give you.[/b][/u]
English
#Destiny
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I bet they are fragments of Crota's sword, and you have to reforge them. Each class will probably get an element, and you will have to cross the streams to take Oryx down.