Enchanting Question: Always On

[Anthony]

Unfortunately, create air cannot do that, as it is an instant spell. The spell you need is Hold Breath. However, power modifies every enchantment on an item, not just one, so it would subtract from each spell separately. The total cost would be 5,100 energy (900 for hold breath, 200 for air vision, 4,000 for Power 4), and presumably it would give four miles of air vision, not one.