"Firecrest and glass pumpkin are now available for purchase"

[HyoMinPark]

I actually havent done much in PotD, what do those do?

When you clear Floor 200, you're rewarded with a Firecrest or a Glass Pumpkin, which you can then trade in for either a glamour earring or a yard trophy (there are 2 kinds of each, one for the Firecrest and one for the Glass Pumpkin). They're basically bragging rights for those who have cleared PotD in its entirety, and some very well-earned bragging rights, in my humble opinion. I know some will probably not see it as that way, but I went through a lot to get my Floor 200 clear, and it just doesn't sit well with me that people can purchase them without having to actually clear Floor 200 to do so.