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 enchantments are cast from a Laboratory directly from the strategic map by choosing the Cast Ritual Spell action. They cost great amounts of gems and require strong skill in magic. For each global enchantment, there is a minimum gem requirement. If more gems are used, it's harder to dispel the global enchantment.

The following is a list of all Globals available in Dom3. As we can see, Mother Oak, Gift of Health or Burden of Time are likely to be cast early in the game, as they are only level 5 spells.