On the information Sol get on the library of Celes. The River of Styx is the blacklist water you can see in the Underwold. This signify it's word 'styx' as shuddering. Currently Sol is walking on a desserted land and sa dulo nito makikita ang first river ng Underworld. Which is the Styx. Ayon sa information, the river of styx is the most easy sa anim na rivers ng Underworld. As long you know what you're doing, then you're safe. Not only that there is a certain rules sa 1st river na ito ng Underworld. You need to find the old man. This old man is the only 'living' being or undead sa buong River of Styx. The old man or mas kilala bilang the Ferry Man can help anyone to cross the river of Styx. Gayunpaman it's not that easy. You will require a lot of gold or something na makak