First Book of the Gastar Series

In a post-apocalyptic world with humans faced extinction as the priests of the God of the Dead release undead humans children born and bred for battle face the enemy outside the great wall of the Great City of Gastar. After the humans gained victory in sacrifice of many lives and culture a second menace arrives to complete the original mission of the undead. Zermon ruler of all Hell places himself just outside the city; bringing forth his own demonic horrors with plans to make Gastar part of his world in Hell. One human now remains in Gastar; knowing of the past and aware of Zermon's plans; a small human girl assassin named Shevata. She along with her dragon mentor her associates from the past and the humans fight for their very existence.