The quest chain is a reference to the game Darkest Dungeon, based on the game's narrator's quotes. In case anyone is curious, I will post which quotes are referenced. Bear in mind, I am not posting the entire quotes on some, as they are lengthy. But if you want me to post entire quotes, then ask.
Ruin has come: references the intro cinamatic, "Ruin has come to our family. You remember our venerable house, opulent and imperial. Gazing proudly from its stoic perch above the moor."
Flush them out: references the cleanse expedition, "These salt-soaked caverns are teeming with pelagic nightmares. They must be flushed out!"
Trinkets and Baubles: references the wagon, "Trinkets and charms, gathered from all the forgotten corners of the earth"
The Weight of my Ambition: references the drowned crew(seems the captain in game also references the game), "While the greedy dogs slept off their revelry, I hexed their anchor with every twisted incantation I could muster. Imbuing it with the weight of my ambition, and my contempt for their crude extortion."
Indefatigable Purpose: references not using a shovel to clear debris, "Without tools of iron, you must rely on flesh and indefatigable purpose."
Malign Inspiration: references the siren(seems the enchanted siren also hints to the game too), "The pact struck, my newfound accomplices slipped silently beneath the brackish water. A fearful stirring at the edge of the torchlight betrayed a familiar witness, and gifted me with malign inspiration."