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1. 75% is not 100%; under otherwise equal conditions, it can still be resolved.
2. 75% applies to absolute values; you still need to reach that point. On Expert difficulty, it's 50%.
3. "Unstoppable Magic" removes defense, but not resistance. If the magic is used and doesn't work, what should the poor little elves do? Join the skeletons...
By the way, we seem to have gotten off-topic. This isn't about elves!