[quote=@vancexentan] [@Phase Transit]Wiki states that Gandr doesn't cost mana but it does cost one's physical health. It's a cast from health type magic. I'm instituting limits based these quotes The quotes say that they need to replenished. As such I put in rules regarding how many times a spell can be used. Emiya in Fate/Stay can only use up to ten or so of his infinite blade works replicate at the end of the anime which is how I'm gauging how much mana is supposed to cost. [/quote] To expand on this, most spells are cast using a small amount of Od (prana) from the magus to start the process and then the rest of the magical energy required is taken from the ambient mana in the surrounding environment, which is channeled through the magus' Magic Circuits (presumably this is why incantations are needed). Gandr [i]does[/i] cost prana then, and while I'm not sure how much, it's implied it isn't very costly (although the usual version isn't as powerful as Rin or Luvia's).