This spell creates an envelope of air, surrounding the caster, that lasts for 10 minutes in a planetary body with or without air. Within the phlogiston or on a spelljammer ship, the air lasts for 3 days. This spells isolates a volume of air from its surroundings. The "barrier" it forms offers only the slightest resistance to any person or thing that travels through it. All the barrier does is keep the air inside of it from mixing with the air outside.
For instance, a volume of air would be unaffected even if the Stinking Cloud was cast near it. It would also keep the noxious gas inside if it the spell was cast there. If cast while underwater, the envelope of air would rise to the surface, leaving any creatures who were inside of it where they are.
Also, it allows spells and other effects requiring air to function. However, if a burning fire is within the envelope, any remaining time is reduced by half.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, increase its duration within the phlogiston or on a spelljammer ship by one month (30 days) for each slot level above 1st.
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