The Bobo Temple can be found west of the Solino Valley. Once you arrive, there will be several Bobos (large white creatures) you need to defeat by first throwing a pot at them to knock them down then attacking them with your sword while they are down. Your task in this place is to light all 10 braziers, both inside the temple and around it.
Outside Temple
Inside Temple
When you’ve gotten all the braziers, the gates surrounding the coffin in the middle will lower. Please note that there is a fast travel point you can unlock here on the northeastern side of the temple’s exterior.
In the corner to the left of the coffin (when facing it) there is a spot to dig up that reveals a ladder.
Climb on down to receive 10 Dindi. Move the 2 tall wooden platforms as shown in the picture.
When you hear a ding-a-ling, you’ll know it’s in the right spot! Once both have been moved into place, pick up the pumpkin near the piano in the northwestern part of the temple.
Carry it up the stairs and to the right. Push aside the frog statue near the balcony then pick up the pumpkin and follow along the narrow path.
Throw it at the frog with the mirror to cause the mirror to turn!
Return to the pumpkin and pick it up. Carry it back up the stairs and follow the path further to reach the other frog with the mirror. Again, throw it at this one to change the direction of the mirror.
It will reveal a pressure point on the floor in front of the coffin. Head outside an lure a Bobo to this pressure point. When it steps on it, the coffin will open and you can then head inside! Head all the way down the stairs. At the bottom, swing under the stairs to find a room with Topazzo in it.
Speak with him then exit the room. There is nothing if you head underneath the other stairs, so head back up the stairs and swing left under the tree roots.
Follow those stairs down and around to reach a set of stairs going up. Head on up to trigger a cutscene with a ghost! He’ll say that if you find his daughter Saraia and get his medallion back, he’ll show you how to fully access the tunnels in the sewer to get to the other side of the castle.
To speak with Saraia in The Misty woods, which is northwest of Bobo Temple, you must follow the trail of glowing blue flowers that appear. The first is to the west of the map transition to Bobo Temple. From there follow the path west then northwest until you reach a pavilion. Speak with Saraia under it, and she will disappear after she gives you a Cursed Ghost Medallion.
Return to Cacia in Bobo Temple to show him the medallion. He’ll then tell you to visit Topazzo in the next room to learn about the secret passage to the sewers under Rodia that will lead you to the Abandoned Royal Mansion behind the Castle where the Owl Bomb is stored. Speak with Cacia who will reveal an entrance behind a bookshelf. Climb on down the ladder to reach The Underground! Follow the path around. When you reach the stairs, follow the fork to the left to find 2 chests containing 10 Dindi each. One will be at each of the dead ends along that path.
When you’re ready to proceed with the area, return to the stairs and follow the path east and go down the stairs. Head northeast.
When the path forks, take the northern path to find 10 Dindi. Head back to the fork and take the southern path to find 10 Dindi in a chest. Return to the stairs and take the southeastern path to come to a door.
Enter through the door. Step on the wooden platform in the water. When you’re ready, use the fire to burn the web holding the platform in place.
As you sail along, you’re going to want to keep your fire out. You’ll need it to burn the webs and swinging sacks. As you go, you’ll also need to kill the tentacles. When you reach dry land, there will be a chest containing 10 Dindi just before a ladder. Climb up then step on the pressure point under the fish mosaic. The path to the southwest will take you into Rodia. Follow the path southeast to find a chest containing 10 Dindi at the dead end. Head onto the wooden walkway diagonally from the chest then turn left. Push the block out of the way. Backtrack until you see a row of boxes and push them out of the way.
Continue forward and push the stone out. Turn left to find a lever. Push the lever 3 times until the scene of the water draining plays. Head southeast then follow the path northeast then northwest to arrive at a hanging platform.
Stand on it then quickly make your way through the water to the western stairs and head up them. At the top of the stairs, head west passing the lever to reach the area that was previously gated. Head into this area and cut the grass under the mosaic to reveal a pressure point.
Stand on it to unseal a grate. Return to the water and push the box to the pillar as shown in the image below.
Climb back up the stairs and turn the lever once to cause the water to rise. Walk across the newly made bridge to arrive at a circular passage.
Head through then drop down to the very bottom where 3 spiders await. Take them out to unlock the area. Head through the door on the southwestern side to leave. You’ll emerge back at the lever. Follow along the water to renter the room you were just in via the circular passage. Grab a pot and chuck it at the fish in the wall that has a lever in its mouth.
Backtrack to those golden doors in the previous room in the northeastern corner.
Head inside and step on the pressure point. Afterwards, return to the previous room with the wall fish lever and head through the door on the right. Hit the lever to create a shortcut in the previous room to the well in Rodia Town and the previous The Underground used to get to Rodia Town. Head all the way back to the lever and use it to drain the water. Enter Rodia Town via the shortcut diagonally from the starting area in this place. Renter The Underground via the entrance at the end of the path along the river near the inn.
The chest in this room contains 10 Dindi. Head down the stairs to find 3 levers. If you purchased the book entitled Symbols of the Sewers at Rodia Library, you’ll be given clues on what 2 of the rings should look like. If not, just look at the picture below for the answer!
Now head to the well in Rodia to renter The Underground. Take the platform to the second level and enter through the door straight ahead. Push the long pole sticking out all the way into the fish on the wall until you hear a ding-a-ling! The door to your right will unbar. Head through it and turn left to find an owl statue. Push it all the way off the ledge on the right side of the screen. Drop down after the statue onto the stones along the wall then continue pushing it until you reach the pressure point.
Push the other owl onto the pressure point to open the way forward. Head inside and burn the webs to continue forward. Eventually you’ll reach a room with an octopus mosaic on the floor. A brief scene with Topazzo will trigger. He’ll tell you that one lever is missing. You’ll need to find his sister Topa in Jacu Oasis. She’ll be dressed in red and her house is the tallest in Jacu Oasis with a big windmill on top. He suggests that the blacksmith might be able to help us turn the rod she’ll give us into a lever to replace the missing one. Furthermore, he’ll say that we need something to resist the incredible heat during the day but at night we should be prepared for the extreme cold.