When you go to buy slots from the vendor, does it take your Mist like in crafting equipment?
In any energy related transaction that isn't a trade/mail between players mist will be always used before crystal energy, so yes, it will take mist before ce.
What Paw said. That's EXACTLY what happens in ANY energy related case.
In any energy related transaction that isn't a trade/mail between players mist will be always used before crystal energy, so yes, it will take mist before ce.