So, after you speak with Inspector Sinai turn left to the water area (colored with blue), go straight, again forward until you reach the room where the Temple Inspector is. Go into the room behind him and kill Boss Hillas. Return to the Temple Inspector and talk to him. After that, go straight on to the little fountain and forward through the coming room. You will reach a bridge where Boss Papion is. Kill it and go straight on but remember this place because you will have to return here later. On your way you will reach the fire area (colored with red), pass the bridge and go with the road. You will find another Temple Inspector and you should turn right to kill Boss Kinsus. After that go back and speak to the Temple Inspector. Once you've finished, go straight on (I went into the room on the left just for showing it to you). You will soon enter a room where you should go into the room on the right to kill Boss Gargos. Once you've done it, go back to the last Temple Inspector (I went forward again to show you the area) and go straight on passing him until you will reach the bridge of water where you killed Papion. There, you have to go under the water and, on the left side, you will reach an entrance to the final Boss Adantum. After you kill him, Inspector Adler will appear and you'll get to choose a C-grade weapon. Once you've done it, the dungeon is over.
I got 75% xp at lvl 50 doing this dungeon. This used to be a harder quest where bosses hit really hard and you needed to use the potions dropped by the pots / vases.
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