The Elder explained that the Shadow Serpent, an ancient entity of pure darkness, had been imprisoned within the Sunstone for centuries. However, the seal was weakening, the Shadow Serpent's influence growing stronger.
To defeat the Shadow Serpent, Lysander would need to master the power of the Sunstone, to learn to wield its light against the encroaching darkness. The Elder, recognizing the boy's potential, agreed to train him in the ways of the Sunstone, guiding him on the path of light and enlightenment.