How it'd work, for events like events/minor holidays, for rightful kills, you'd have a chance to get a form of collectible in your currency tab. There'd be a new tab to come with it, where you could trade in those drops for shards, other currency, etc. I thought of the idea earlier today, since I'm coming back from break, and I think it's a nice idea for them. If you had any left over, they'd convert to the closest reward to that number. Like, 25 for X currency, and you had 27 left, it would round down back to the 25.