a better name would've been "Dues ex Machina", because it allows the author to throw out all sense and have the MC win an unwinnable battle, rule of cool winning over established world building. Lots of MCs of course have similar "overcome the odds" moments, but usually don't have a codified "David vs Goliath" skill. Would've preferred something he could use intelligently along with his growth to "punch up", instead of having a skill that's just "massive increase in damage when the odds are against you".