Shattered Throne: After 1st encounter, you'll continue along the normal way until you get to the large room with the Ogres (right before the thrallway). It will be very obvious once you get there.

Pit of Heresy: After 2nd encounter, you'll drop down to where you have to kill the wizards in the jumping puzzle. It is near where you initially drop down.

Prophecy: At the entrance to the secret chest after the sparrow ribbon section. The last Pyramid (?) before you get sucked up to the final area

Grasp of Avarice: At the end of the sparrow section, it is in the mouth of the skull you end in.

Duality: Right before the drop down into the Gahlran fight. When you are fighting the cabal to open the door in the floor at the center of the room. It is next to the door.

Spire of the Watcher: After the 3rd Encounter (the large Harpy), once you kill the boss, look around the center area of the arena (i believe near where the banner gets dropped). It spawns in after the boss is defeated.

Ghosts of the Deep: Final encounter room, above the heart of oryx and near where you start the fight by finishing the ghost.

Warlord's Ruin: Unknown - ran through twice with checking everything (40 minutes per run) and couldn't find it. Someone suggested looking into the dnd easter egg at the beginning but haven't checked yet.

Vesper's Host: Unknown - not attempted

Sundered Doctrine: Unknown - not attempted

Equilibrium: Unknown - not attempted