Ultravision enables the recipients to see natural light that's normally invisible to humanoid eyes, effectively illuminating darkness to the intensity of dusk or dawn — the darkest stage of twilight, after sunset and just before night.
|Duration||1 hour per level|
|Area of Effect||1 creature per level|
|Casting Time||1 round|
This allows seeing without the need of artificial illumination, even underground. Details are perfectly visible up to a distance of 120 ft. There is not quite sufficient light to read, however, so the spell doesn't permit studying magic books in order to regain spells, or the reading of scrolls in casting magic.
Normal activities can be carried out comfortably, such as making or breaking camp, cooking, tending to the weak or infirm, tending animals, performing work that doesn't need close inspection and the like.
As far as witnessing the movement of creatures at a distance, details become quite indistinct beyond 120 ft. Missile penalties for dusk apply when targeting enemies; beyond 300 yards, it would be quite easy for medium-sized creatures to approach the camp without being seen, though the spell will enable recipients to need proper illumination exactly as it would appear in these light conditions.