1) A creature born from the Abyss, or virtually anything that absorbs way too much Abyssal energy and still manages to live. Un-living objects given will by the Abyss also counts.
2) The invisible chains that wrap around the world which prevent it from falling into the Abyss. A certain golden-haired troll, tried to cut them (twice...). The first time he was stopped by a now equally mad (not to mention furious) dark-haired,eyed,clothed man, and the Tragedy of Sablier occured (as opposed to the Tragedy of the World. Well the second time...nobody really know whats happening....it seems to be stable /|O.O|\