I just beat Icasaracht and the Soul Gem and I assumed it would take me back to the inn so I could begin TofTL. But that didn't happen. I saw the end credits for HofW and then IWD instead. Now what?

Sorry, but in order to do the expansion you are going to have to start HoW over again. Once you beat Icasaracht and the Soul Gem that is it or you are returned to Kundahar. You should do the Luremaster expansion as soon as you get back from the glacier.

But you can do it over from scratch, start a new party, it will be fun. Or even better stick it on HoF mode and use your existing party to do the Trials of the Lurmaster.

If you have a saved game from JUST before you talk to Hjolldar to go to the see of moving ice to confront Big Scaly I, you can go and talk to Hobart in the Inn in Lonelywood to start TOLM. Otherwise, pritchke is right and you'll have to restart.