How was sans born?

Sans, a character from the game "Undertale," is a skeleton who is part of a race known as the "Monster" species. He was born from the magical and chaotic energies that resulted from the war between monsters and humans. In the game's lore, monsters were originally living beings, but after being defeated and sealed underground, they were transformed into their current forms, including skeletons like Sans. His laid-back personality and humor contrast with the darker themes of the game, making him a fan-favorite character.