Along your journey, you'll find various crystals that will enhance certain
abilities. The crystals will, however, soon fade, crack, break, and finally
crumble. When the crystals break completely, they will be removed from stock,
and their powers will be gone. Keep an eye on your crystals. If it looks like it
will break soon, highlight the certain crystal, select "DROP", and pick it back
up. It will be renewed as if you never picked it up.