Lord Loss - Darren Shan

The king of horror's demonic symphony in ten volumes, now available in omnibus editions - each containing two titles in the spine-chilling Demonata series.

Lord Loss:

When Grubbs Grady first encounters Lord Loss and his evil minions, he learns three things:
the world is vicious,
magic is possible,
demons are real.
He thinks that he will never again witness such a terrible night of death and darkness.

.He is wrong.

Demon Thief:

When Kernel Fleck's brother is stolen by demons, he must enter their universe in search of him. It is a place of magic, chaos and incredible danger. Kernel has three aims:
learn to use magic,
find his brother,
stay alive.
But a heartless demon awaits him, and death has been foretold.