Quetzacoatl's Noble Phantasm weapon, Piedra Del Sol, is a blast of solar energy. It is based on Quetzacoatl being a sun god in Aztec mythology (accurately, one of five sun gods who periodically governed the world).
The name "Piedra Del Sol" is Spanish for "Sun Stone", after the ancient Aztec relic that depicts the creation of the universe. Quetzacoatl summons her Phantasm with a sun stone design.