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Remilia's power to control fate is useless. It's completely relative.
Like many other characters who have this power, she is easily defeated by fighting spirit and pure strength. She can't control your fate if you're stronger than her, so it only matters if you're weaker than her. If you're weaker than her, who gives a shit if she can control your fate, she can kill you regardless.
Face it, she doesn't control shit.