Pau Yajin tells you, "So you've already helped us investigate the three other Tanada temples! You are both brave and dedicated. I must ask your assistance as well, as my colleagues Sayuji Jina and Meshenq have already done."
Pau Yajin tells you, "I ask you to journey to the Tanada Temple of Black Water, in the swamp at 24.2 S, 57.1 E. There you must find the Tanada assassin known as the Master of the Depths. Slay him and bring me his jade medallion. I will need his medallion to be able to get to the bottom of the corruption of that clan of Tanada."
Head to the location Pau Yajin gives you. You will find a Sho Spire and a cavern dug into the ground. Inside the Spire is the Shrine of Black Water, which is used later in the quest. The location is guarded by 3 Acolytes of the Depths. Enter the cavern. Sticking to the left, you will very shortly come arcoss the Black Water Gatekeeper. Kill him and loot the Black Water Key, which unlocks the Black Water Threshold (resistance 9999) just down the hall. Behind this Door is the portal into the Black Water Temple (no level restrictions, cannot be tied, recalled, or summoned).
Like the previous Tanada dungeons, it is simple enough to navigate your way to the final room. In this final room you will find the Master of the Depths, who drops the Jade Medallion of the Depths. Return to Pau Yajin in Sawato.
You Give Pau Yajin Jade Medallion of the Depths.
Pau Yajin tells you, "You have done well to retrieve this medallion from the corrupted Master of Depths. You can see the corruption in the jade itself! What a terrible thing has happened to a once-noble House of Nanjou Shou-Jen. Our sources tell us that the key to the corruption of the Tanada can be found back at the Temple of Black Water. There is a Virindi Watcher there whose lair may be accessed through the Shrine of Black Water. Go back to the temple and use the shrine, and you should be able to find your way to the lair of the Watcher of Black Water..."
Head back to the temple and use the shrine:
You feel a hot warmth wash over your entire body as the Shrine of Black Water seems to recognize you and pull you in...
Once again, it is simple enough to run through the dungeon to the final room. In the final room you will find the virindi called Watcher of the Black Water. Kill it and loot the message shard and broken virindi mask.
You allow Pau Yajin to examine your Black Water Watcher's Shard.
Pau Yajin tells you, "Ah, unfortunately, I cannot translate this... You may wish to bring it to Diyas al-Yat of Zaikhal for translation."
Pau Yajin tells you, "You've got the mask of the Watcher of the Depths. Please hand it over to me and I shall reward you."
You give Pau Yajin Mask of the Watcher of Black Water.
You've earned 34,455,313 experience. (level 157)
Pau Yajin gives you Mask of the Depths.
Pau Yajin tells you, "So it is done. The foul Virindi presence that has corrupted the Tanada has been rooted out. This will not save the souls of the Tanada who have already been corrupted, but at least we know what we are dealing with and can take appropriate steps. I am grateful for all the help you have given us."
Pau Yajin tells you, "If you don't need that mask, I'll take it back in exchange for practical training."
You give Pau Yajin Mask of the Depths.
Pau Yajin tells you, "Really? You're not interested in this lovely mask? Pity, I find it quite stylish. Still, if you don't want it..."
You've earned 6,891,063 experience. (level 157)
You give Diyas al-Yat Black Water Watcher's Shard.
Diyas al-Yat tells you, "Well, this is disturbing..."
Diyas al-Yat tells you, "These Tanada from the House of Water seem to have become the pawns of forces greater than themselves. Here, have a look for yourself."
Diyas al-Yat gives you Translated Black Water Watcher's Shard.
You allow Pau Yajin to examine your Translated Black Water Watcher's Shard.
Pau Yajin tells you, "Very interesting. I thank you for sharing this with me. You can keep the translation, however. It is not very useful to me. I am satisfied that the Watcher of the Black Water has been defeated."
