This spell prevents any dragon who fails its saving throw from entering the area of effect. The spell affects a cubic area whose sides equal the caster's level times 5 feet; thus, a 16th-level caster could affect a cube whose sides each equal 80 feet. The dragon can cast spells, blast breath weapon, or hurl missiles (if possible) into the area of effect.
Dragons within the area of effect when the spell is cast are not affected. If such dragons leave the area of effect, they must succeed a saving throw to re-enter the area.
The spell's effectiveness can be greatly increased with the casting of a focus spell.
The material components are the priest's holy symbol and a dragon scale.
Notes: Common for to priests with major access to the sphere of Wards (ToM).
High-Level Campaigns Book Addition
Dragonbane: This spell can be the subject of a site focus.