I may be the first person to come across this, so I thought I would let you know. To date I've received 5 Cruxes of Crota. I've noticed that you cannot hold 2 Cruxes of Crota on a single character. I had one in the vault and one on my first character and was hoping to see if they could be consolidated to one slot (Crux of Crota x2 in one slot), but was surprised to see that I couldn't even take it out of the vault even though I had 12 available slots in my characters' inventory. The error message said "no available slots in inventory." I can't help but think this must be unintended functionality. I can understand if you cannot stack them in the same inventory slot, but I should be able to at least hold more than one per character.