There are a few points you must remember, such as:
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there was this half blood named Hercules child of Zeus who had to do these twelve jobs. he was so brave and he became a constellation
Hercules suffered from a poisonous blood that was sent to him. It caused him such excruciating pain that he persuaded a friend to burn him alive.
Hercules was a 'demi-god' meaning he had some of the gods blood in him, all these heroes had some god blood that gave them special powers over something, Hercules was strength
Yes, Hercules defeated the centaur Nessus in Greek mythology. During an encounter, Nessus attempted to abduct Hercules' wife, Deianira, prompting Hercules to shoot him with a poisoned arrow. Before dying, Nessus tricked Deianira into taking his blood as a love charm, which ultimately led to tragic consequences for both Hercules and Deianira later on.
Hercules' wife accidentaly kills him. The Centaur Nessus offered to take them across a river that they needed to cross. Nessus tried to kidnap Deianeira (he takes her across first) but Hercules kills shoots him with a poisoned arrow. Before dying, Nessus tells Deianeira to take some of his blood and save it in case Hercules becomes unfaithful (he said the blood would make him fall back in love with her). One day Deianeira gets told rumours about Hercules being unfaithful and makes him wear something (can't remember what) with the blood on it. As the blood is poisoned from the poison that killed the Nessus, Hercules died. Hercules is half God, so he was allowed to go to Mount Olympus and was set as a star (I think) by Zeus.