I'm starting a new fantasy campaign and was reading through this since I grabbed it last sale. It's great, love the presentation! If you don't mind a few suggested corrections? Some typos:
Page 42, a tiny black-colored "The" above the image.
Page 100, a "thier" in the final sentence
Page 141, a double space in "to force the players"
Page 149, the d4 table lists values 1,2,4,6
Page 153, "trove in a dungeons"
I love The Lost Keep and am definitely adding it to my campaign!