Ninja Gaiden II/Chapter 5: The Aqua Capital

"Elizébet's whereabouts remain unknown, but her twisted plans continue to unfold as she unleashes the fearsome power of the Demon Statue. Wherever she goes, its power awakens one of the Four Greater Fiends from his long slumber. The roar of Greater Fiend Volf, Ruler of Storms, echoes throughout the beautiful city of canals, transforming a Gothic Castle into an evil fortress"

After the chapter begins, head forward. You will be attacked by several Purple Ninjas and Claw Ninjas. Head forward. To the right of the stairs ahead is a Muramasa Statue. If you have a good amount of Yellow Essence, I recommend saving it because you are about to get a new weapon. Head up the stairs and to the left, down some stairs. You will be attacked by some Werewolves. Their grab attack is pretty damaging, so keep them at a distance. At the bottom of the stairs is a corpse containing a Kusari-gama. Head across the water to the opposite platform and follow this platform to the end. Here is a chest containing Red Ki Essences. Turn right and run across the water for Crystal Skull (#10) and a 20 point achievement that goes with it. Head back to where you descended the stairs. On the way back, you will be attacked by some Water Scorpions. Dispatch them with your shiny new Kusari-gama.

When you reach the bridge head across and down into the market area for another skirmish with a larger group of Werewolves. Take them out, smash the crates and barrels in the area for some Yellow Essences and then head forward and left through the archway to find a Dragon Statue. Save/heal and head through the door at the top of the short stairway. Immediately through the door, you will be attacked by four Werewolves. Kill them and look on the table to your left for another Crystal Skull (#11). Head over the bridge to the right and kill the four Werewolves that attack you. From here, head right and then right again. In the back left corner of the alley, perform a Flying Bird in the shaft and kill the two ninjas that attack you. Search the corpse for a Talisman of Rebirth. Drop down.

Back in the alley, walk straight ahead and down some steps. Head left at the bottom of the stairs and open the chest for an Herb of Spiritual Life. Head back up the stairs, right and across the bridge. When you enter the open area, you will be attacked by about 8-9 Werewolves. Stay on the bridge to prevent yourself from being ganged up on and just focus on cutting off limbs and doing Obliteration Techniques. Cross over the small bridge ahead and into a courtyard. Search the corpse there for a Spirit of the Devils. Return to the cobblestone pathway and head toward the colonnade and fountain ahead.

When you reach the fountain, you will be attacked by three more Water Scorpions. Hop into the fountain and toward the back to find a chest containing a Gatling Spear Gun. Finally you have weapon that is semi-usable underwater. Swim into the tunnel to the left of the chest. After exiting the tunnel, head left and take out the Octopi with your new Gatling Gun.