What level should the players be on average after beating liebdaga at the end of the infernal syndrome?
The next book (Mother of Flies) assumes the PCs are "well into 9th level" when it begins, and The Infernal Syndrome itself says the PCs should reach 9th level by the adventure's end (on page 7).
Ahh thank you, ya the book I was using sort of has some of the earlier pages falling out, apparently they had some bad habit of falling apart because of bad glue. Thank you for the info I appreciate it.