Aster Travails Son of Satan

Aster Travails is as the name of the book suggests the son of Satan and he has a very odd life ahead of him after his 12th birthday he taken from his parents and brought to a tower one in which he is told he must ascend to before moving on to his next faze, he is told this by the tower master. And later Satan explains it is a demonic tower where the people within are tortured souls and the workers are demons, all demons must ascend the tower before they are aloud to torture. It is a trial