Ars Magica : Golemsburg
A powerful dragon with shapeshifting abilities.
Chattilix was first encountered in the valley of Carradas, where he was performing an abyssal ritual on the unhatched egg of Arkliss.
In his true form he appears as a great warped dragon, covered in many eyes that stare out across the world and tendrils that writhe of their own accord.
At the very least he is known to be a competent shapeshifter, having been able to adopt a human form.
He appears to have passable knowledge of the Order of Hermes and can travel into other planes seemingly at will.