How does a characters magical or technological aptitude affect skills used on that character?
If you shoot a gun at a skilled mage, the bullet will have difficulty maintaining a steady trajectory, and may miss on account of this. The mage weakens the physical laws that the bullet uses to stay on target, such as the stabilization imparted by spin. The spell Stone Missile will have a similar problem when used against a master technologist. The technologist reinforces physical law, making it harder for the Stone Missile to stay on target, or to impact with the usual force. When one character uses a skill on another character, both characters’ aptitudes are taken into account. The acting character may receive a bonus or penalty from his own aptitude. The aptitude of the target can contribute a penalty, but not a bonus. When a spell is cast, the technological aptitude of the target is subtracted from the magical aptitude of the caster. If the result is positive, a corresponding bonus is applied to the spell, representing the superior magical aptitude of the caster. If the result is
