Spoiler: Ixion

[Serapy]

After you finish the Pharos you can go back and get the elevator to a lower level. That is called the Subterra

so it's actually related to first/second and third ascents? I don't know where is Penumbra Interior either, i checked the maps looking for that name but no luck

edit- ooo found it, I didn't know that the main entrance lifter has access to penumbra! O-o, I wonder why was it added? is it for the ixion hunt, the serects linking to the story or both? When i saw penumbra as the only destination place to travel, is there any more places rather than penumbra to discover??

thanks for your helps ^_^