Magic stones... What were they, and what were they good for?
Magic Stones had several different uses for magicians. The first and simplest of them was a mana reserve accessible to any type of mage.
In normal situations, one's mana was limited to one's level. No matter how dense one's magical powers were, sooner or later, they could be used up to the point where the magician would reach a state of magical depletion. When this happened, the magician would temporarily lose the ability to use their mana for spells and abilities in order to keep the body alive. In this situation, one would be forced to use some sort of regeneration potion or meditate to recover.
However, a blacksmith crafting a weapon, an alchemist preparing pills, or a warrior fighting could use mana from alternate items to compensate for the energy expended during their action.
