Dominions 3: The Awakening/Magic/Global Enchantments

The most powerful rituals affect large portions of the world. These rituals are known as global enchantments. Once a global enchantment is cast it will continue to affect the world each game turn, until someone dispels it or the caster dies.

Global enchaments are cast on the strategic portion of the game and they cost great amounts of gems and require strong skill in magic.