Onimusha: Warlords/Underground temple

Once down the hole follow the path and 2 ninja genma will attack. In the next screen is an ornate entrance. To the left of the stares leading inside is a chest with the Und. Temple Map inside. Be careful when you approach the stairs since a ninja genma will jump down once you begin to scale them.

The shrine
Once inside there is a shrine with a mummified monk guarding a scroll. Take the green scroll and gain Sougen's Note. It gives more details on the ogre's gauntlet and opens a secret door. Past the door is a hallway filled with 4 soldier genma (2 in either direction). To the right is a dead end with a cupboard containing Seiryu. Backtrack and take the left hall that leads to a door. This room contains 6 breakable vases and a shrine holding the Thunder Orb. One of the vases hides a chest that contains Journal #1. After getting the journal go to the shrine and claim the Thunder Orb. Your sword can now turn into Shidan and use the magic spell Raizan.

To the left of the shrine is the next hallway. Down the hall is a trick treasure box. Continue up the stairs to exit the temple.

South Area
Once outside immediately in front of you hidden in the bushes is a chest holding a Magic Jewel. Continue down the trail until you reach another building. To the left of the entrance is a magic mirror and chest containing an encoded request. Since you only have 1 out of 4 books to use to encode it move on.

Since you found the Thunder Orb you can remove the barrier on the door and go through it. On the other side is a bridge filled with spiked spinning genma that will charge at you. Be careful since this area does have respawning enemies. At the end of the bridge is a few breakable wooden shades. Behind one is a chest containing the South Area Map. Leave the bridge to enter a courtyard with several available directions.

Courtyard
This area is filled with randomly generating spinning and large axe wielding genma, be careful. To the immediate left is a barred door. The main walkway here is a loop leading to the main building and an area to the left beside the building. You can't go in the building yet since it needs a fire orb to pass. The left path is blocked by an axe wielding genma. He is a prime target to practice your new magic attack on. Go to the left area and encounter a man being attacked by 3 soldier genma. If you are able to save him he collapses and will give you an herb. He will also tell you of a giant monster that took princess Yuki under the dry moat. The broken wall here leads to the dry moat but will need the rope ladder from earlier. The only other new paths is a locked door marked with red ink. To enter the dry moat you will need to activate the rope ladder from your menu.

Dry moat
Down the ladder will lead to a small field. Go inside the door to find a magic mirror and another encoded chest. There are 2 doors here. Enter the one not requiring a fire orb to

Inside of the door is the large genma that had kidnapped Yuki.

After Osric is defeated the door you came in is destroyed. The 2 remaining doors are a flame orb door you can not go through yet and a door to the west. Take the western path to find Journal #2 and a heavy iron door. The door leads to some breakable urns that have a Fluorite hidden behind them and a bizarre skeleton filled hallway. Enter the next door for to encounter Guilderstein at work. He lectures you and sicks his new creation, Raynaldo, on you. This tentacle armed brute. After suffering a few attacks he will fall and split into 2 enemies. Blocking works well against all attacks but beware of his large range. After Raynaldo is defeated look to the left of the large tablet of writing to get the fire orb. Now you can get through those fire orb locked doors and get back outside. The fire orb will give you access to the sword Kouen and magic spell Enryuu. This new sword is overall slower yet more powerful than the Shiden. Use whichever one suits your fighting style and go back to the room Osric was in. Backtracking will show that the previous hallway is now capable of having spinning genma spawning at random.

In Osric's room you will encounter your first floating genma. Be careful around these since they will steal your souls before you can absorb them. If you don't defeat them quickly they will disappear and those souls will be gone forever. Since one of these genma took the souls from Osric's disappearing body kill all of them quickly to get it back. Past the door that was locked with a fire orb barrier is the entrance to Osric's room. Visit the Magic Mirror if desired and go back outside. This area will now have generating ninja genma so be careful. Go up the ladder prepared to fight a big axe and floating genma. Now you can enter the main building.