1 Point: Myen'Tal, The Last Tempest. I liked the setup and there were some strong moments. I'm not sure the ending quite sold what was happening as clearly as it could have, I got a tiny bit lost as to why the mage didn't cast his spell and what was happening to him.
What Eatheron is experiencing is a more subtle possession, by the dispossessed spirit of another Mage, which can linger in the world in corporeal form if they are strong enough. You are right, though, I did not really explain how casting that spell worked, which was the Comet of Cassandora. I tried to show that Eatheron cast his spell through implication, but killed himself in the process. Didn't seem like I executed that too well
, but you live and learn.