Link - Conquer yourself

Oh, the nostalgia. When I was a kid playing through OoT, I had no idea you were supposed to use the megaton hammer to beat dark link, so I just beat him with the sword. Took like 15 minutes of fighting. To this day still the toughest boss battle I had in that game, and the whole time I was thinking “why the fuck is this so hard, it’s just a mini-boss”