There is an oceans of acid that helps the lava rocks extra hot for the floating continents. The surface is very dangerous and the heat can kill anyone.
The air is unbreathable to humans and other oxygen breathing lifeforms.
Nebula Vampires are advanced and very hostile towards invaders. They speak a language unrelated to other languages in the entire solar system. The J'Krassai live in stone house called a nwyll.