"Then what are they?" He presses. His mental picture of them is even less clear than the ghosts-that-can't-be-touched. But Shinjirou is having trouble describing them as well, so maybe this is just another thing he isn't meant to understand, just like healing artes.

It stings, a little, but Jade is better about accepting his limitations now than he had before.

"You use them to fight." That was the only clear bit of information he managed to glean. "They must have abilities beyond what you're capable of on your own."