Tethersense

You touch a willing creature and it will receive tethersight of 60 feet. While the creature has tethersight it can follow the trails of spells cast to their original caster. The tether will take the shortest route, but will not go through walls, magical barriers or sudden drops of at least 10 ft. wide and 20 ft. deep. If the object is flying, the tether will gradually go down to pursue its path to the caster. The color seen of the tether is unique to the spell cast, but not to the spell itself or the caster.
If either the spell's effect or caster moves, the tether will adjust to the new locations. If the creature loses sight of the tether, it will not disappear. The creature can find the tether again if it comes within 60 ft. of range.
Unless your vision is obstructed by solid matter, you can still see the tether through magical darkness or blindness, but only the tether. You cannot gain additional benefits from other vision granting spells while you have tethersight.