So this is how it's going to go.
Long explanation.
When you kill a monster there is a chance you get a piece of a random part of a irl money avatar and you have to put it on a table in the lab and once you get all of the pieces you can buy it for coins instead of irl money.
Short explanation.
When you kill a monster you get a piece of a money avatar and you have to put it on a table in the lab once you get all of it you can buy the avatar you got the pieces for coins.
Also devs if you add this then make it so you can pick the money avatar you want and if it's a limited you have to get the pieces before the avatar is gone and show the coin price.