Obsidian Alcatraz

When a group of miners on the sky city of Port Jericho accidentally release an ancient magick, a force they have never dealt with before assaults the Jerachi.
As the killings continue, the city of mercenaries and hunters begins to fall prey to the fear. Collapse and utter destruction threaten the city, until unlikely allies set things right and put Port Jericho on a new path.
But what if they are faced with a killer they cannot see?