The tale of how Hades became god of the underworld. Once up on a time Hades was living a normal life. But he was very very bored. He asked his most trustworthy servant to find him mortals to have fun with.
After the servant found himself two mortals, he flew them over on a flying carpet to the house of Hades.
The servant gave the mortals directions to Hades his secret hiding spot where he liked to gamble. The mortals however were very skilled gamblers and they had a massive debt. They were ready to make money
After they were finished gambling, Hades had lost all of his money. He became furious and was ready to obliterated them. They had to escape quickly and got away. Hades decided to seek council from his older brother Zeus.
Zeus and Hades his other brother Poseidon had been arranging with Hades and each other who should rule what part of the world. Because of how immature and irresponsible Hades had behaved, he received the underworld. A world for the dead and the bad. The two mortals were the first to enter the underworld of Hades.
The bad deeds of the mortals could not be left unpunished after all. And that is how Hades became ruler of the underworld