The Cruxis Crystal is a significant artifact in the video game series Tales of Symphonia. It serves as a source of power for the organization known as Cruxis, which seeks to control the world of Sylvarant and its counterpart, Tethe'alla. The crystal is central to the plot, influencing the actions of various characters and the unfolding of the story. In the game, the Cruxis Crystal is linked to the concept of Martel, a goddess who plays a crucial role in the lore. The crystal's abilities allow for the manipulation of mana, which is vital for sustaining life in both worlds. Its significance extends beyond mere power, as it embodies themes of sacrifice and the struggle for balance between the two realms.