Board Thread:Questions and Answers/@comment-38588364-20190220195458/@comment-29602226-20190307081621

It depends on how powerful the monster is and how much energy and time she spends on the spell. At the upper end of the scale, a coven of witches sent a whole country to another dimension once...

If we are speaking of just battle magic, a powerful caster could burn a town with a fireball, but they would never do it.

In monstergirlsredux.com they show spells that make powerful MG casters impervious to damage and let them easily corrupt heroes and armies. Powerful healing magic can regrow limbs, but Order clerics won't use such magic, since there is a chance the patient will become superhuman...