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Nope, they do not have xtal sales as far as I know. You can get then from quests, buy them with real money from the Oracle, or get them free from the devs every now and then.
 
It's from a spell that costs mithril in the alchemist. It's temporary by the way, not permanent. To unlock the alchemist it requires a level II castle. To get mithril you have to war (or buy it during one of the various mithril sale).
 
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