Cash Points

Cash Shop

An internal store where you can buy tickets to events and various kinds of buffs, jewels, pets, spells, enhanced potions, etc. More than half of this store can be dropped from monsters or crafted by your own forces in the game, but some things are absolutely indispensable.

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).
This store can be opened only in the capitals 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.