The temple in the Lake of Sorrow can be found in the forest. There are a few locked doors inside, as well as a portal in the middle of the main chamber. The portal will send the user to the Cult Site below.
|Spoiler: Upon entering the portal, the Princess will be separated from her party and must deal with the Cult Site on her own. After some exploration of the tomb on the Isle of Prisoners, the Princess will return to the temple and be reunited with her party.|