Earthfest

A spell lost to the ages, Earthfest is a 10th level Epic Magic inaccessible to mortals by divine law.

A spell created to allow continued mining of areas that would otherwise be too dangerous to mine, a casting of Earthfest makes large underground areas impervious to cave-ins and similar disasters. Its uses can also be adapted to preserve structures as objects within the sphere's area are reinforced by the Weave itself

The caster begins by enclosing a circular area with adamantine stones specially marked with a drop of the caster's blood. The size and shape of the stones are irrelevant, but the stones cannot be spaced further than 10-feet apart or the spell will fail. The circle made from these stones represents a sphere within which the spell will take affect. All structures and the earth within this sphere are magically stabilized and made impervious to all forms of nonmagical damage starting from the sphere's center and progresses uniformly outward.

This spell is costly, dangerous, and requires intensive planning by any mage attempting it. For every 10,000 pounds of material affected, the casting time for the spell increases by 1 minute and 1 pound of adamantine is consumed. If all of the marked material components are consumed before the spell's completion, the caster's hit point maximum is reduced by 1 per 10,000 pounds of material as their lifeforce becomes forfeit to fuel the spell. The caster must remain inside the sphere during the casting or the caster's life will immediately be forfeit to the spell and immediately die.

If the caster dies during the casting of Earthfest, the immediate area outside the sphere of equal volume becomes a region of permanent dead magic. Magical effects within this area are dispelled as if within an antimagic field. Magical matter, force effects, and energy fields are simply destroyed.

The affects of Earthfest can be dispelled, but only in 5-foot cube increments. The casting of Earthfest cannot be halted by an effect of 9th level or lower.