Walkthrough of Tercessuinotlim (Tercessuinotlim Guide):
To get to Tercessuinotlim - First, join the Citadel (type /join citadel). Next, go to the cave. After that, take a right, then across the long path. It will take you to a room with two doors. Continue through the right door, and then there will be a portal in a room referred to as "The Bone Room". Enter the portal and you will join room one of Tercessuinotlim.
1) Strand of Vaths Hair (To exit room one, also need Escherion's Chain).
2) 50 Bone Dust (To enter bone room).
3) Escherions Chain (To exit room one, also need Strand of Vath's Hair).
4) O-dokuro's Tooth (To enter the Maze Rooms).
5) 50 Cubes (To enter Swindle Bilk's room).
6) Aracara's Fang (To enter Girly Girl and Gothy Girl's room).
7) Hydra Scale (To enter Miltonius's room).
8) 50 Defeated Makai (50 Makiai are required to reach any NPC other than Oblivion).
Maze Path) From the beginning of the area (after entering the portal), take the left door. Next, you will see a three-way fork with two Makai. Enter the right door. You will be in a large room with two doors against the back wall, three blue glowing paths near the bottom of the room, and one pathway leading to a cave in the the upper-right. Take the glowing blue path on the bottom-right. You will be in a similar room. Take the pathway leading to the upper-left, and you will enter a room with a long path going from the upper-left, where you are, to the center of the bottom of the screen. Go to the bottom of the screen to enter the Maze Rooms. The Maze Rooms all have three caves directly in front of you.
Nulgath Path) Use the instructions above to enter the Maze Rooms. Take the middle door, then the right, middle, right, right, left, and left. This should bring you to a room with Miltonius, the Shadow of Miltonius, and Skew. Click Miltonius to enter Miltonius's room.
Swindle Bilk, Girly Girl, and Gothy Girl Path) Use the instructions above to enter the Maze Rooms. Take the middle door, then the right, middle, right, left, right. Now, you should be at the Twins, Gothy and Girly Girl. Walk past them to the right to enter Swindle Bilk's room.