[Taqwus]

On domes: There are three that protect, and three that retalliate.

Protection --
Dome of Solid Air (A5, 20 gems): 80% chance of stopping any (?) spell coming from outside the province, including yours. Goes down if penetrated or if caster dies; permanent otherwise.

Forest dome (N5, 10 gems?): IIRC, 30% chance of stopping. Goes down when burned by fire spells, or caster dies; permanent otherwise.

Dome of Arcane Power (Astral, don't recall): 50% chance of stopping each incoming spell. Goes down if caster dies, or when spent gems run out (something like 1 turn per addn'l gem).

(?) Seem to recall possibility of certain exceptions -- astral window?


Retalliation:
Domes of Fiery Death, Dome of Frost: Don't block spells, last only until spent gems run out, attack with appropriate element.

Dome of Corruption: Tries to Feeblemind those who cast into the province. Also occasionally sends horrors against mages under the dome.