I admit I'm not a fan of the "old school" style of play. A lot of it seems to hinge heavily on metagaming. If one of your characters died because of brown mold, how do the other ones magically know how to avoid it? How does one of your characters who is on their first trip out of their home town know to check a long abandoned crypt for live traps on the door handles? If no one in the group survives the Beholder fight, how does the next group know to be wary of it? So many questions, not nearly enough answers.