Npc's Dialog Options

Yellow Stat Exchange: The top option, "Yellow Stat Exchange", is the option that initiates the yellow stat exchange, taking your bad yellow stats and giving you a good yellow stat.
Orange Stat Exchange: The second option, "Orange Stat Exchange", is the option that initiates the orange stat exchange, taking your bad orange stats and giving you a good orange stat.
Ask for details: Full list of good stats it can give you.
Ask for information: This is the option that directs you to this page, for detailed explanation.

How can I exchange stats?

As shown in the image below, place your 10x useless stats from the 'Grotto of Horror' dungeon anywhere in your bag as 'Mana Stone Tier 5'.
Note: Please remember that the type of stat you wish to exchange will be taken into account. If you want to exchange a yellow stat, make sure to collect bad yellow stats! Or, if you want to exchange your orange stats, make sure of that as well.

If you are sure that you have met all the conditions, talk to the NPC again and click 'Yellow Stat Exchange' if you want to change the yellow stat, or 'Orange Stat Exchange' if you want to change the orange stat, and they will take your bad stats and give you a good stat in return, as well as exchange your bad stones for a flower.

What are good stats?

The three option, "Ask for details", shows you the good stats you can get in detail.