In every game there is always mana that is bound to your self.. but how about if some wizards could use \"outer mana\", in many games, or in almost everyone that has magic, the mana will be used from yourself, from your mana bar, but if there would be alternative for this.. the outer mana source, you wouldnt have any mana inside yourself, you would use all of your mana from other sources like Fairy Ponds or Magic stones.. so you could choose would you have normal mana thing or get mana outside from objects or buildings.. if using outer manasource you wouldnt run out of mana, but you couldnt cast spells everywhere and in inner mana you could cast everywhere, but could run out of mana, and the innermana using would be faster, because it is drawn from yourself. (I hope that you can understand what i ment)