No. No it's not a secret. But I'm not sure it's something you're ready to know.
Oaths and bonds are important.
Well, you know it's the name of my bar / pub / drinking establishment. Or are you asking with Limbo actually is?
I've got plenty of whiskey here. There's a train you can get on that takes people around Preya. Kinda like a more compact metal vessel that runs on tracks.