Amumu is one of my favorite champions lore-wise, because it seems so simple, but sad. Are we ever going to get the full backstory for him, as to what happened to cause him to be mummified and preserved in that pyramid?
I'll take a shot at it...
Ages ago, the Shurima Desert was populated by a group of technologically advanced Yordles. At the peak of their civilization, Amumu was born to the Pharaoh and his wife. Amumu lived a cheerful life, being royalty in an advanced civilization. He received everything he wanted and was educated to take on the throne when the current Pharaoh would pass. However, the current Pharaoh was cruel. Many Yordle slaves worked to death under the hot sun to create the magical floating pyramids, a symbol of the Pharaoh's greatness. Amumu saw this, and secretly planned to become a kind ruler, one who would be loved by his people. His people, however, assumed the worst: that Amumu would be as bad a ruler as his father. They were not willing to take another lifetime of this tyranny. A group of them paid their souls to Renekton, the crocodile god of the desert, empowering him to demolish the Pharaoh's reign. The few who stayed loyal to the Pharaoh were quickly eviscerated by the crocodile's massive blade. Renekton strode into the throne room, where the Pharaoh faced him with his wife and son. A single slash, and all three lay on the ground, convulsing in a pool of blood. As Amumu felt the world grow distant, another came into focus.
"Place your heart upon the scale so that you may be judged," A booming voice called. Standing before him was Nasus, a massive jackal-headed god of the afterlife. Amumu stared in a daze as his body moved itself forward on wobbly legs. His arm reached within his chest, cut open by Renekton's vicious blade, extracting a heart, still beating. He placed it on the scales. Nasus stared at the scales in silence, contemplating when they did not move. "Why are you here?" he asked.
"Because my people are angry at me. I did not deserve the throne, so I was killed," Amumu replied. "But surely you know that?"
"I know what happened. But I don't know what you believed happened. Your people have been consumed by rage, and my brother is fueled by it. They would rather unmake all traces of this civilization than serve another generation under a tyrant. But they were unwise to fuel my brother's wrath. He will not stop until all of Valoran has been destroyed," Nasus said.
"Valoran has its own heroes. It will be safe, won't it?" Amumu asked.
"No hero can stand against a god fueled by the fury of an entire civilization," Nasus replied solemnly.
"Isn't there anything we can do to stop them?" Amumu asked, crying.
Nasus considered the scales a final time before responding. "You still worry about your subjects that betrayed you? You are too kind for your own good."
Amumu shook his head. "As I am not like my father, my subjects are not all the same. There are innocents in this matter, and even those who rebelled had reason to do so."
Nasus stood in silence before responding. "Very well. I can make an exception for the child of a Pharaoh. Remember what you're asking for will have a cost. As the rebels relinquished their souls to my brother, you must pay yours to me. The god of rage consumes souls. The god of the afterlife preserves them. But do not think that this is any smaller price to pay. If you pay your soul to me, you will be cut out from the cycle of life and death. You will be reborn, without memories, unable to die. You will desire companionship, but only be able to watch your friends age and die as you stay the same. It will be an eternity of suffering."
Amumu replied without hesitation. "My soul is worth less than the souls of all of Valoran. Make the pact."
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