The caster transforms the stone walls of a castle into iron walls, making it almost impregnable. The alteration lasts longer if additional gems are used in the ritual. The enchantment will end if the caster is killed.
(Fort defence increase: 1000 points.)
- Required Research Alteration 7
- Required Magic Skill 5
- Gem Cost 10
- Spell Type Ritual
- Effect Type Local Enchant Province - Gem Duration
- Works Underwater true