make sense.

But he still hero, and not ordinary hero but a dragon slayer one.

2 years without any food, water, or exercise would make him more like a skeleton. If they did not have any kind of stasis magic to preserve him, then he is burning through 1200 calories, 50g of protien every single day. After 730 days, that is 876,000 calories (113kg of fat) and 37kg of muscle. In any universe, he should be dead unless he was so morbidly obese that he was the size of an adult grizzly bear.