I'm surprised we don't have an official, pinned thread for Underrail's plot and lore yet (or maybe there is one, and the search function just refuses to spit it out?). It's been officially out for a month now, with most of us having been familiar with the game for longer, and while I presume that a large number is playing the game for its mechanics more so than for its narrative content, I still think the latter is absolutely worth discussing.
I suppose the anticlimactic reveal of Underrail's origins and the decidedly unmysterious nature of Tchort, the Faceless et al. are not to everyone's taste, but I for one really love the way Underrail handles its buildup, remaining grounded and downright stoic from beginning to end, antithetical to the sweeping epic plots with their contrived twists and turns in many modern RPGs, and even pulling off a bit of a meta commentary on the genre itself, without going all self-aware and ostentatiously ironic unlike e.g. Larian's Divinity games tend to do.