Black Sun. Why Teachers are Killed

There is no place for two suns in the sky. The red sun has set. But a new sun has risen. With the help of forbidden magical techniques, the student manages to resurrect the Teacher, who died under mysterious circumstances nearly four hundred years ago. The world has changed. A powerful spellcaster from the past gets a chance to live a new life. What secrets does his death hide and what will the resurrection lead to?