TLDR; A slave monster survives horror, war and servitude, while trying to live with himself. 

Thralls are a race of monstrous slave soldiers, in a universe where biological magic takes the place of technology. Centuries ago, their ancestors were desperate humans, who volunteered to be transformed for the Poison War. Today their unfortunate descendants are still soldiers and laborers. In contract law they are 'corporate wards'; slaves owned largely by arms dealers.

Dally Harper starts this story as a champion cage fighter. He is one of the 'lucky' ones. It's all downhill from there.

Content Warning:

Explicit violence and gore, slavery, implied sexual assault.

None of these are framed as positive or glorified, however they do have a strong impact on the plot and main characters.