While the original was for the tConfig version of Terraria, there is a "revival" effort to port it to tModLoader for modern compatibility. Other Story-Heavy "Souls" Downloads
Originally released in 2013, this mod transforms Terraria into a dark fantasy action-RPG. It is often distributed as a .zip file containing the custom map and necessary mod components. Download Dark Souls zip
If you are looking for the narrative history, this is a graphic novel collection that compiles prequels and lore anthologies from the comic series. While the original was for the tConfig version