In a circular room, located in the center of their great city, 8 mages gather. They are masters of their craft, power incarnate, and as they look upon each other, they see fear for what is to be done. Slowly they begin their chanting, and within one hour, a pulse is felt throughout the awaiting city. A sphere of pale blue light, ever shifting, has slowly formed along the walls of the great city, shimmering in the sunlight, glistening with power.
The Athanasian sphere is a protective shield formed around a city to protect its inhabitants from magical attacks from opposing armies. The shield effectively dispels any spell of a lower or equal level cast to anyone inside the sphere or against its walls. This makes fireball, hunger of hadar and similar spells effectively useless against the city, making a siege a lot more difficult.
To break an Athanasian sphere a spell of dispel magic cast at level 9 needs to be cast, or a wish spell. Other then that, killing one of the eight wizards controlling the spell will cause it to fail. If the caster is 20th level and casts the spell at 9th level, it is possible for them to cast it themselves, but this requires a dc 19 intelligence saving throw, if failed, the spell fails and the spell slot is expended.
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