Sigma: Retribution System of The Fallen

Only the most pathetic fall to the bottom of the abyss, but every legend has crawled their way up from that very place.
...
Damien is a death row prisoner. As he counts down his last days, to his surprise, he is bought by the Sigma company. The Sigma company brought Damien and a few others up from the brink of death, only to toss them down once again.
Now Damien and his new less than agreeable companions must fight increasingly ghastly monsters for their freedom and immediate survival.
After they clear labs by the skin of their teeth, the Sigma company gives them strange injections. To Damien’s shock, these injections gave them superpowers he could only dream of.
This was his chance for freedom, for all of them to start anew.
Only problem? There was more to these injections than any of them could imagine. Was this really a chance for freedom?
Or was it a one-way ticket to Hell?