What to use from Hall of Judgment for my DF/DFRPG game?
First off, I'm not going to read the finished adventure end to end. I've read parts, but not the entire thing. This at least retains the possibility that I could play it. I won't run it (I have too much to run as it is), but at least it's possible I could get in there and play if someone runs it.
The rules and monsters? I read them all. What will show up in Felltower?
Short version - not all of it. I've been running my DF game for over 100 sessions and 7 years; we've solved a lot of problems that new rules are meant to address.
Fantastic Dungeon Grappling will inform how we run our house ruled grappling. I like FDG but it does make some decisions differently than how I chose to make them earlier. Doug and I had worked on a simplified TG for DF for a while, and I took that and stripped it down further and did my own thing with it. But FDG deals elegantly with some issues that we didn't directly address, and so we'll use a merged version of them.
Field Dressing Game will see use since one of our players likes to have his character butcher and eat things. Especially weird things.
The Wilderness Survival rules are nice, but I'm satisfied with what we use from Dungeon Fantasy 16: Wilderness Adventures. I get why Doug re-invented the wheel; DFRPG didn't have any rules and he probably didn't have access to use the materials from DF16. You wouldn't go wrong using these; but like FDG, I have others already.
From the Bestiary there are some critters I will use. I don't generally use a lot of normal animals, in fact I almost never use them - and there are a lot of normal animals in the book. The various bandits, warriors, etc. I don't need - I use the basic stats for 62-point delvers from DF15 instead. I will certainly use some of the faerie stats, if my players ever figure out a way into (well, under) elf hill, although they should be warned - I'll change them to suit my particular conception of Faerie. The ice alf and krabbari would fit right in with some minis I have, so they go in. I like the vaettr but I'm not sure I can fit yet another wight variation into my game; it's fairly full of them already.
so Hall of Judgment is a solid get for me, even without running the adventure. A good base of faerie critters, a couple of demonic and elemental monsters, and some modifications to my grappling rules. If you don't have you own grappling rules, don't use DF16, and will use the adventure, this is an excellent supplement.