A "Guide to Dungeons" could cover a lot of subterranean monsters that haven't necessarily been done yet. Volo's has some of these, but there's enough remaining to make it interesting. A portion of the book could actually focus on unintelligent creatures -- kind of an "ecology of the dungeon" vibe. It could also discuss types of dungeons; a megadungeon under a mountain needs to be approached different perspective than an ancient undisturbed barrow.
It would have plenty of stuff for the DM, notably traps and hazards and weird dungeon phenomena. Plus some more monsters, of course. Sample maps and more random tables might be good. But the biggest thing I would want is a supply of really good puzzles since they are the hardest to come up with. It would be hard to do that in a book players are expected to purchase; you'd want general "puzzle types" with randomized elements. E.g., matching-word puzzles, and a list of 20 word-pairs that work well.
For players, spells and subclasses and feats that are useful for dungeon exploring. This could include some reprints, such as the Gloom Stalker and Monster Slayer rangers and certain spells (I'm not opposed to a few reprints if they are appropriate to the topic -- it helps with "PHB +1" and cuts down on the number of books you need to bring to the game).
Plus, dungeons are one of the most iconic parts of D&D, and they are featured at all levels of game play.
Uncle Trapspringer's Guide to Dungeons is a functional title, but I kind of like Halaster's Home-Improvement Handbook better...
It would have plenty of stuff for the DM, notably traps and hazards and weird dungeon phenomena. Plus some more monsters, of course. Sample maps and more random tables might be good. But the biggest thing I would want is a supply of really good puzzles since they are the hardest to come up with. It would be hard to do that in a book players are expected to purchase; you'd want general "puzzle types" with randomized elements. E.g., matching-word puzzles, and a list of 20 word-pairs that work well.
For players, spells and subclasses and feats that are useful for dungeon exploring. This could include some reprints, such as the Gloom Stalker and Monster Slayer rangers and certain spells (I'm not opposed to a few reprints if they are appropriate to the topic -- it helps with "PHB +1" and cuts down on the number of books you need to bring to the game).
Plus, dungeons are one of the most iconic parts of D&D, and they are featured at all levels of game play.
Uncle Trapspringer's Guide to Dungeons is a functional title, but I kind of like Halaster's Home-Improvement Handbook better...
