Shakir was a hero amongst the townspeople. But like all heroes, his tale had to come to an end sooner or later.
No matter how powerful humans become, or how much they level up, they are not and can never be compared to monsters.
They are both beings that grow stronger with time, but it gets to a certain point for humans where after a certain time, they start to age, and rather than become stronger like monsters, they grow weaker.
The body they have spent their whole lives building up, wanes with time, while for monsters, it grows stronger with time.
That is the prime difference with monsters and humans, too much time is advantageous to one side, while too much of the time is disadvantageous to the other.
There are ways by which the humans can bypass the time disadvantages, but only rarely does such a case comes to be, as most already grow too old to attain said opportunity, and so, they become bound by time itself.
