Go to Chateau d'Oraguille and click on the door to Prince Trion's chambers. (If you were a Paladin when you completed A Boy's Dream, you may have already received this cutscene.)
You may finish the quest as any job at this point.
After the cutscene, head to Southern San d'Oria and talk to Vemalpeau (M-7), who lives inside the small house nearest Lion Square, on the bottom floor.
Then go to Lion Spring's Tavern and talk to Najjar.
Next, head to Count Caffaule's Manor (B-6) and talk to Ullasa. Ullasa will tell you about Mique's Paintbrush. Once you see the reference to the paintbrush, you are flagged and can go key hunting.
To the right is a map of the coffer locations. Basically, all the coffer drop mobs are in the four corners and the tunnels leading to the four corners. To get to these corners, you need to drop down into four different holes. But, the northwest hole will only lead to the northwest corner, and once you drop, you need to make your way back up to get to a different hole.
Open a coffer and obtain Mique's Paintbrush. Coffer can be opened on any job.
Note: If you have a current artifact quest active from this coffer, the coffer will produce the artifact and not the Mique's Paintbrush.
Note: This can be picked as a Thief, since Paladin does not have to be your main job to obtain the Paintbrush.
Proceed upstairs in Vemalpeau's house. Immediately to your left, there are three spots that can be examined. Click on the painting on the wall above the first spot and select the option to "look behind the frame" and then "examine a letter." You will receive a Strange Sheet of Paper.
Go to "Helbort's Blades" (K-7) and talk to Exoroche who will tell you that you need to dip the letter in a well in Davoi to have the ink appear.
You need a full alliance of level 55+, a full well rounded party, or high level help.
The area should be cleared of Orcs as they will link.
They are BOTH immune to Sleep AND Lullaby. One-eyed Gwajboj can be slept by a 75 RDM, though not reliably. WHM75 with 250 divine magic skill was able to elemental seal + repose One-eyed Gwajboj.
As 99 THF/NIN the area has changed since 75 cap and the mobs nearby con weak or easy prey to you. I cleared the 3 mobs near the well but when i poped the NMs and got One-eyed to about 50% he two houred and somehow linked the mobs in the nearby camp area. I flee'd to Monastic Cavern zoned in and then right back out. All the mobs between the well and zone had linked and most despawned, so the run back to the well was clear. I caught back up to one-eyed at G-9 and was able to kill him solo, without linking respawns. Fight took me a little while as I am a fresh 99 THF with mostly level 75 gear. I recommend bring friends.
As 75 THF/NIN you can solo this easily with evasion gear and Bloody bolts. Pop the NMs and Flee to Monastic Cavern and zone in. Zone back out and you can just pull One-eyed Gwajboj and fight him right at the zone to Monastic Cavern. Beware of Orc links. I ended up fighting 3 orcs at once but that is how I soloed this mission.
As a 75 SMN/THF using the above strategy. Garuda all the way (used Astral Flow to maintain MP up. Due to it's Cure IV spam had to switch to Carbuncle where we held it on for a bit to recover enough MP to finish him off with a stronger avatar. Sneak Attack and Spirit Taker made it easy to get full MP.
Solo'd as RDM/NIN. Used Powder boots for flee then popped NM and ran to Monastic Cavern. Zoned back in and pulled One-eyed. Converted once during fight. Make sure to have en-spell on during Invincible to continue dealing damage. Kept the 2 links I had asleep during fight.
I just kept this simple, went RDM/BLU killed Three-eyed Prozpuz then Gwajboj, killed anything that linked after i was done with Gwajboj, got my item and left
Solo'd as Rdm/Pld. Killed all orcs near well and then popped nms. Pulled them to left corner facing away from well. Needed to nuke Prozpuz when it was down to 5% because Gwajboj starts spamming cure4 on him(and he appears to be immune to silence). Gwajboj alone is easy until 10%, Orcs even far away seem to link at that point. Didn't do zone trick because it honestly doesn't work. They start heading back to the well the second you zone out. Recommend to duo this fight.
After killing the NMs, only one Well Weight will drop. So if you have more than one PLD who needs the quest, you need to kill them both again and again.
Trade the Well Weight to the Village Well for a cutscene where the letter will be displayed in the log window. You will also get the Knight's Confession.
Go to Jugner Forest and head to the Maiden's Spring which is located in E-6 of the map. Once you get to the edge of the pond, a cutscene will occur.
If you arrive by chocobo, you do not need to dismount to get the cutscene, though it will look as if you do.
Finally, head back to San d'Oria where you may optionally talk to Ailbeche and Exoroche or simply head to Chateau d'Oraguille and talk to Prince Trion for a final cutscene and to obtain your reward.
Game Description
Client
Trion (Prince Royal's Room, Chateau d'Oraguille)
Summary
Knights whisper of a traitor in their midst. An outsider is needed to investigate.