Jim, thanks for the feedback - I will definitely be thinking about upping the SR. The players have nearly cleaned out almost all of the fiendish creatures that are in the region as it stands, though - they've taken out the darkmantle lair and the stirge lair, and just have some rat swarms and other fiendish things left.

Of course, it would be best if I started remembering to apply SR...
Sadly, the stat blocks have been one of the most-criticized things I've seen about the WLD, especially in terms of skill points and the like and monsters/NPCs with class levels. I don't know if you guys did them by hand or used programs such as eTools, but I'm finding it wiser (and easier) to run everything through eTools when I prepare, and fixing errors in pencil. But, yeah, the fiendish templates are messed up for Region A. Oh well. It could be just a special type of fiendish?

No worries. I can understand the difficulties in doing 1000+ stat blocks perfectly, especially given time/space constraints and complexity. IMO, it's a small price to pay for the high-quality encounters.
The PCs definitely know Longtail was a wererat, and that combined with my GM-cackling about how lycanthropy can be transferred has truly got them on edge for that fight. I'm very pleased about this. And plus, since I'm running two groups through, I get the best of both worlds - screw with one group by switching the encounter, and inflict lycanthropy on the other group!

I love GMing so very much.
In response to Crothian's question, Arum's possible fates are mentioned on page 146, at the introduction to the "The Wizard's Domain" area. (I have to say, I like the idea of him becoming a lich... hmm. Maybe he could end up being the lich in the random encounter in Area N that comes around asking for diamond dust?

)
Region C looks like a lot of fun. I'm thinking of working up paper props to represent the different pieces of journals and the like that the PCs can find in the Region - that might make things more fun and realistic.
A question for Jim, though - if everything was entering through the same entrance as the PCs, why/how is the titan's body still undisturbed? (The PCs asked the lizardfolk this question - I improvised with the idea that the lizardfolk demanded that Longtail order the orcs and kobolds to treat the body with respect.) Also, this same question goes for the gnolls and anything else that has entered through the same point - the gnolls from Region C, in particular, seem to have entered just after Longtail and his army did, as their introductory GM text describes them fighting their way through the humanoids and fiendish creatures in Region A. Interesting. I may change that some, though. Ideas on how to fix that so as to not put in too many more entry points while still keeping it roughly believable? (as in, so they don't all enter at the same time!)
Thanks!
Edit: Oh, and the WLD claimed another victim today. The party rogue got hit with 10 points of CON drain from cleaning out the stirge room (A80), and then the party made a beeline for the nasty box trap (A84). 1d6 CON initial, 2d6 CON secondary. Ouch. What really hurts is that he missed the Search DC to find the trap by one, missed his first Fort save by one, and finally couldn't make the second Fort save despite burning three action dice on it. RIP.
