After doing some searching on Candlekeep, I see that there is an adventure set in NorthDark where it calls it Reluvethel's Wood. The adventure is in Dungeon 67, does anyone have this that can give me a summary?
Might be better to see if they have it in electronic form on Paizo.
And if the PCs DO win their ways through all the liches to Larloch, “he” will almost certainly be just another lich (loaded with explosive spells) set up as a decoy, with dozens of hidden liches waiting to pounce on any surviving PCs who ‘celebrate’ after they take Larloch down. As the REAL Larloch watches (magical scrying) from afar. Myself, as DM, I’d be wondering: “Such a glorious game, so many opportunities laid out before your PCs to devote your time to, and THIS fixation is the best you can come up with? Are you SURE you’re adventurers?” -Ed Greenwood