From what I've gathered around here, batman appears to be able to 'solo' just about anything and everything, no matter size or numbers.
What gives? Why is he so unbeatable?
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His character is supposed to represent humanity. We're not the most dominant species on the Earth because we're strong, fast or agile physically. We're at the top of the food chain because of our brains. That's why he's so powerful. Mind over matter essentially.