Myth - Rel. - Huitzilopochtli (Aztec)
Huitzilopochtli was the Aztec god of the obsidian knife who sprang forth from his mother's belly to kill his siblings.
Huitzilopochtli
His mother's pregnancy with him disturbed his brothers and sisters who tried to kill her, but Huitzilopochtli sprang from her fully adult and armed and slew his siblings. He was the Aztec god of the sun and war.