Cash Points & Cash Shop

Cash Points

This is a currency that can be used to make purchases in a special store inside the game - Cash Shop.
There you can buy various boosts for your character, pets and other useful items).
You can enter this store while in the safe zone by pressing X

You can purchase Cash Points
https://mu.bless.gs/index.php?page=services&act=buycashpoints

If after pressing X on the Dark Lord class you are unable to make a purchase, remove the horse and raven from the character to your inventory and try to enter the Cash Shop again.