I think I have gotten about 5 now. Last night i was a little upset though, I had that thing you get from Werner active and after a crucible match, I got really happy because it dropped 2 runes of desire. Saw both of them on the right side of my screen on top of a weapon that I got. Went to my chalice, and there was only one there and I had space for more runes. Kinda bummed i didn't actually get that second one.