This is a crossover story of Metro 2033, it follows, not the tale of Artyom, but of a Ranger by the name of Kalain. In the story, the main plot will be focused on finding out who and what this Entity Jeremiah (Aiden) is and find out what had caused it to attach itself to Kalain. Enjoy, also, reader discretion is advised, there will be some, iffy, parts in this story... Thanks!