The Circle of Magic (Spoilers all books incl City of Dragons)

['thul]

Considering that the magic is based solely upon Elderling blood, it would be logical that the more blood you have, the more power you can get. Since elderlings have pure blood (which the characters from DK & DH will eventually get), they will also logically have access to all the magic. Most likely humans, even those with greater amounts of elderling blood, will not have enough blood to be able to handle the forces evoked by trying to use the entire spectrum. It is not unlikely that FitzChivalry had the trouble with the traveling stones because his blood was far from pure... The elderlings would not have relied upon any technology/magic that would be dangerous in the long run to use... They would have basd themselves upon safer means of transportation....