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Eywa is a first generation Titan that was created by the Old Ones in order to be the God of Charon a title which she held until the destruction of Charon and her eventual death.

Eywa in her role as goddess of Charon would spend centuries turning the waste that was spread across the moon into usable power sources and with the assistance of the Old One constructs she was able to move the entirety of the waste into large Storage Towers built inside of space ships that could be jettisoned into space if things got out of hand. Eywa would lead the defences of Charon when the forces of the Draenei led by Malekor attacked Charon and despite being horribly outnumbered she was able to effectively resist them and deny the forces of Malekor access to the towers leading to the Battle of World Tree.

Goddess of Charon
Eywa in her role as goddess of Charon would spend centuries turning the waste that was spread across the moon into usable power sources and with the assistance of the Old One constructs she was able to move the entirety of the waste into large Storage Towers built inside of space ships that could be jettisoned into space if things got out of hand.