In a world where technology has merged with the essence of life, a lone figure stands as the guardian of the last energy source. This being, an amalgamation of advanced mechanics and human resilience, holds in their hands a radiant orb, pulsating with power. The energy illuminates ancient inscriptions, revealing secrets of a forgotten civilization that once harnessed the cosmos. As the guardian, your task is to decipher these inscriptions and unlock the mysteries of sustainable energy, ensuring the survival of your people. What will you discover as you delve into the depths of this technologically-enriched history?