Thin Air

Frostburn (Fr)Updated Supplementals (3.5)

Thin Air is a D&D 3.5 spell (Necromancy) from Fr. On class lists for Cleric (Level 2), Druid (Level 2), Cleric Variant (Level 2), and others. Range or area: Medium (100 ft. + 10 ft./level); Saving throw: Fortitude negates; Duration: 1 minute/level; Casting time: 1 standard action.

School
Necromancy
Casting Time
1 standard action
Components
V, S
Range
Medium (100 ft. + 10 ft./level)
Area
30 ft. radius emanation
Duration
1 minute/level
Saving Throw
Fortitude negates
Spell Resistance
No

This spell thins the oxygen in the area, causing creatures caught therein to suffer the effects of extreme altitude sickness.
Subjects failing their saves take 1 point of damage to all ability scores because of altitude sickness (see page 90 of the Dungeon Masters Guide).
Characters acclimated to high altitude receive a +4 competence bonus on their saving throws.
Creatures that do not breathe are immune to the effects of the spell.