Yuga Khan was once the ruler of Apokolips, and he sired two sons with his wife, Queen Heggra. One was Drax, who was basically peace-loving, and the other was Uxas, also a gentle soul. But Khan knew that Uxas, when he finally claimed the Omega Force, would be a powerful force. Still, he didn't think his son would try to kill him and take the throne.
Yuga Khan was obsessed with becoming the most powerful being in the universe, and through this rule the universe as well. But he desired far more than physical conquest, he also wished to learn everything that could be discovered about the universe as well. So naturally, he also became obsessed with solving the mystery of the Source. He wished to know why he and the other New Gods existed. Izaya of New Genesis (who would later become Highfather) tried in vain to dissuade him from his quest. Yuga Khan eventually tried to force his way into the Source, and like all others before him, failed. He was imprisoned on the Promethian Wall and Queen Heggra assumed control of Apokolips. From his vantage point, Yuga Khan watched as Desaad killed Suli (as per Heggra's orders), and as Uxas became Darkseid. Then he saw Darkseid force Desaad into assassinating Heggra in retaliation for his wife's death. And then he looked on as Darkseid ascended to his throne to become the supreme ruler of Apokolips.
Eventually, through an exertion that could shake planets, he was able to tear himself free from the Source Wall.
Yuga Khan is one of the most powerful beings in the universe. He is virtually invulnerable to harm, can fly through space and hyperspace at incredible speeds. He can wield and project extraordinary amounts of energy, enough to destroy planets. Yuga Khan can also drain the energy from living beings and planets into himself.