Earth to Air

Regular
Turns earth or stone into air, which can be valuable to someone who is
trapped underground. The more energy the caster spends, the more earth
he can transform, but he is limited to regular shapes with the largest dimen-
sion no more than four times the smallest one.

Duration: Permanent.
Cost: 1 to transform one cubic foot of earth/stone to air, giving enough air
for one person to breathe for 1 minute. To transform larger quantities
of earth/stone at once, the cost is 5 per cubic yard. Metal may be turned to air
for triple cost.
Time to cast: 2 seconds.
Prerequisites: Create Air and Shape Earth.

Item
Staff, wand, or jewelry. Usable only by mages. The item must touch the
stone to be transformed.
Cost to create: 750 energy and $1,000 in jewels.