You only need to save the game before you turn leave it.
Another reason not to use the saving points is gaining more experience.Each opponent that you kill raises your points.
Using the crystal resets the conversion factor to the initial value.
If you do not want to take too much risk, though, you do not need to worry.
It is a form of challenge that the conversion factor rises and the more experienced players may undertake.
How about completing the game, from the beginning to the end, without using a crystal once?
At some points, the game saves automatically, e.g.
after you enter a New main location, or before a boss battle.
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