Find and deactivate the Vex Teleporter to free Cayde-6.
Find the Vex teleporter and take it.
- Go forward down the slope that you arrive on in the Cistern.
- Turn to the right when you reach the wall.
- Go on through the opening in front of you.
- Follow the corridor to the right from there.
- Follow this path forward to reach the Pools of Luminance
- Avoid the white fluid all over the ground, this is Vex Radiolarian Fluid, which can hurt you.
- Jump across the fluid, landing on the nearby rocks, turn to the right and then follow the stones to make a path avoiding the fluid.
- The path will slowly slope upwards, continue along it avoiding the fluid.
- Go through the circular doorway at the top of the area.
- Turn to the right and continue forward.
- Around the middle of this up-slope, you will encounter a group of 6 Harpies that will spread out and attack.
- When you make it to the top, look along the right-hand side to find an opening to the next room.
- Once again, you have a corridor with landings that is otherwise filled with the Radiolarian Fluid
- Jump to the landing across from you, turn to the right and once again jump across the fluid before turning left to continue forward.
- This leads into a room with an angled glass spire in front of you.
- Veer to the left and toward the plaza in front of you.
- The area beyond the plaza, just up the ramp from you, will have a teleportation animation run in front of you.
- From it will appear a number of Fanatics will appear in front of you, and all around you.
- Clear out this initial wave to deal with a second, this time with Goblins and Fanatics.
- Fall back to the outer edge of the plaza you crossed to give yourself a lot of room to protect yourself.
- The third wave of this assault has Harpies added in as well.
- Amid the third wave, 2 Minotaurs will make their way in.
- Failsafe will chime in at the end of the encounter.
- Make your way to the back of the room and through the slanted opening there.
- Go on up the stairwell you find there.
- Continue forward into the next chamber.
- There you will find the Vex Teleporter you are looking for.