Niflheim

The demonic realm where resides the demon lord. This is an optional dungeon in Tales of Symphonia. You can access it by going to the book with an evil eye in the Sybak library. There are 15 floors in this dungeon. As you run, you lost soulfire. If you loose all of it, it's game over. You must accumulate soulfire as you run through each floor. You will run into the Hell knight in the gamecube version and in the PS2 remake you meet a trio of Mithos, Yuan and Kratos. On the last floor, you need to have between 100-1500(?) soulfire to be able to fight the final boss.