[@Guardian Angel Haruki]
It's a giant dragon made of pure energy with a few moves that can kill with a touch. It was designed to be unkillable and took 200(completely maxed out) players to beat it, and even then it took four hours before they hit 22% health and Sony pulled the plug, fearing an exploit. XD After a huge uproar and finding out there was no exploit they respawned it and it died the next day.