Blastia are power sources. Small ones can be used by people to strengthen their capabilities in combat - that's how we can fight monsters, after all! - while larger ones can be used to power our lights and handle running water and the like. The cities are all protected by a barrier blastia; this keeps the monsters out and is certainly a very important use of it!
So as you can see, they're essential for everyone, and that makes them quite profitable.
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Blastia are power sources. Small ones can be used by people to strengthen their capabilities in combat - that's how we can fight monsters, after all! - while larger ones can be used to power our lights and handle running water and the like. The cities are all protected by a barrier blastia; this keeps the monsters out and is certainly a very important use of it!
So as you can see, they're essential for everyone, and that makes them quite profitable.