[quote]I've gotten 9 of them so far, I find when Eris has the blades of Crota bounty I usually get one with at least one of my characters.[/quote] I got mine from constantly killing the one blade of crota in the fist of crota mission, I never intentionally tried to get it but I knew eventually id get it because I just load that mission to either kill 3 blade of crota fornthe bounty or kill 10 hive majors/ultra.

Both moon and earth

I got two from walking by when some killed a blade of Crota haha