Board Thread:Questions and Answers/@comment-109.153.127.241-20130907125120/@comment-13413401-20130908115756

Those floating things with red eyes are called Monoliths: http://hexxit.wikia.com/wiki/Monolith

Sometimes, you can be teleported to Limbo without dying if you go through an unstable door or use a dimensional door when you are under bad potion effects. If you want to get out and you didn't bring a linking book with out, and you don't want to spend hours trying to find the lowest point in the Limbo, you might as well just cheat and type in /tpx  0 into the chat box ;)