So it's impossible if it's not Gaelion or something like that? In games there'd be an energy bar, though it seems you can attack life force.
"Though you may be from another world, you are still classified as a human, so the Dragon Pulse will not work that well." (Gaelion)
"I see." (Naofumi)
"Also, conducting your own magic power to use Dragon Pulse techniques has bad efficiency. Using magic attained the usual way is probably best." (Gaelion)