Letheia Facility

The Letheia Facility is an extra dungeon categorized as threat 8. Talk to S.A.I.L. to beam there.


 * Acquisition : You will need to complete the space encounter/dungeon Letheia Fleet. At the end of the Letheia Fleet, you will find a map, interact with it to receive this quest and unlock the location in S.A.I.L. interface. The map to the Letheia Labs is in the same place but i don't know what are the conditions for each map (either random or Facility shows up the second time since it's higher tier).


 * Quest Rewards : 1 Hellraiser, 12 000 Pixels, 1000 Research


 * Items Requirements : Sonic Sphere or Phase Sprint tech are required for one room. This dungeon is not about traps, it's mostly about fight and it's a threat 8, so you better bring some good armor/weapons.

Dungeon Guide
Put on your big boy pants, the Letheia Facility is a real challenge. Being a threat 8 dungeon that mostly focus on combat, you will have some real tough fight on your hands. Having tier 8+ armors and weapons is highly recommended if you want to reach the end of the Facility. Inside, you will mostly find Letheia Guards wielding guns with or without a shield. You will also find plenty of Twiguns and Omnicannons. In the last part of the dungeon, you will also find a lot of Letheia Scientists who will first summon a random Ruin ennemy before switching to a rocket launcher.

First Building of the Facility
Head to your right from the starting teleporter and you will quickly meet 2 Guards. A bit further, you will find 2 vans in the way. Once you walk between them, 2 Guards will come out of each van. 1 Twigun and 2 more Guards defend a small structure to the right and the Twigun might attack you when you are dealing with the vans ennemies. You will then reach a small platform defended by 2 Omnicannons. When you walk under the platform, 2 Guards will come out of the van behind you and 2 more Guards will appear in front of you. You will then reach the first building of the Facility. Inside the first room (the pool of lava below you is not a threat), the doors will lock once you reach the middle of the room and 4 Twiguns will spawn on the ceiling of the room. Once those 4 are destroyed, 3 more Twiguns will appear on the floor of the room.

Exit the room to the right and climb down the stairs. After you reach the Inventor Table, 2 Twiguns will spawn above you. Activate the console in the room to the far left: it will lock the door and spawn 2 Letheia Corp Spider. Those bots may not be extremely healthy, but their gun pack a punch and they will explode when they die. Once they are destroyed, the door will open and you can head back to the stairs. 2 Guards will attack you when you get close to the stairs. Climb back the stairs and you will find the door to the right open.

Ride the elevator leading you below. 2 Guards will attack you from the left. You will then need to activate 2 consoles to open the door upstairs. One is located to your right and the other to your left.

Left Console
Head to the left from the bottom of the elevator. You will reach a small lava pool with a bridge going to the other side. Don't trust the bridge: near the end, 3 trap doors will open in the bridge including one right in front of you. 6 flying Drones will also appear and attack you and another Guard will appear at the right of the bridge. To the left of the bridge, you will see a room with a few containers. Once you are in the middle of the room, the doors on both side will close and a Heavy Drone will be unleashed in the room. The Heavy Drones have random weapons going from guided missiles to flamethrowers, so be prepared for anything. Once you destroyed it, head to the room to your left and activate the first console.

Right Console
Climb the stairs to the right of the elevator and you will reach a small hallway. Once you're midway through it, 2 lasers will be shot from the right and they cannot be dodge. To cross this room, you will either need to use the Sonic Sphere tech to cross the room before the laser are shot, or the Phase Sprint tech to be immune to their dammage. The wall console after this room disable the lasers. You will find the second console in the room to your right. However after enetering the room, 2 Omnicannons will spawn above you and 4 Letheia Corp Spider will spawn just outside the room to your left. If you have a Micro Spider Sphere tech, you can also reach the hole in the ceiling and find 2 Ancient Essence chests.

Second Building of the Facility
Once both consoles are activated, take back the elevator and you will find the door to your right open. Exit the first building to the right and you will reach a small tower. When you walk below it, 2 Omnicannons will spawn on the tower and 2 Guards will come out of the van behind you. To the right of the tower, you will find an area with a poison vat above you. It will not open, but once you are below it, 4 Omnicannons will appear aswell as 2 Guards behind you and 2 Scientists in front of you.

Enter the second building and head to the right. The elevator leading upstairs is locked and you will need to find and activate one of the 2 switches to unlock it. To the right of this elevator, the stairs leading below lead you to a room with a checkpoint. Head to the right of the elevator and you will reach a room with laser shooting down from the ceiling. Just stop between the lasers and you will be fine. The wall console behind the lasers turn off the lasers. The elevator to the right will lead you to both switches, one located at the end of the path of both floors.

First Floor
Exit the elevator at the first stop and you will reach a room with a poison pool. 3 trapped door will open below your feet along the way. Use the elevator to the right of the poison pool to reach the top floor. Head to the left and you will reach another room with laser on the ceiling. The exit of the next room is located in the top right but is locked. To open it, you will need to presse the buttons near it in the correct order. You can learn this order in the bottom left of this room, which is 2-1-3. You will then reach a room guarded by 4 Cultists wielding melee and ranged weapons. Activate the small switch on the wall to unlock the elevator. 3 Scientists will also spawn outside the room when you activate the switch.

Second Floor
Exit the elevator at the second stop and you will reach a room with a lava pool. Once again the floor is not protected and will be destroyed by explosions. Press the button on the middle of the room and the entrance of the room will close. 1 Heavy Drone and 1 Letheia Corp Spider will spawn. As soon as a Spider dies, another one will spawn (there's a total of 5 Spiders in this room). Once everything is dead, the exit to your left will open. After you cross the door on the background, 3 Scientists will come out of it. Head to the left and you will reach another room with a wall button. It will once again lock you inside until you kill a bunch of ennemies. This time you will have to deal with 3 Scientists first. Once they're dead, 4 Omnicannons will spawn on the ceiling. Then, 2 Guards will appear. Once everything is dead, exit to the left and you will reach a room guarded by 6 Cultists wielding melee and ranged weapons. You will find the switch that activate the elevator on the wall in the bottom left corner of the room, but approaching it will release 4 Scientists in the room. Going this way will also release a Scientist in the laser room in your way back.

End of the Dungeon
Head back to the elevator and ride it to the top floor. The room to the left of the elevator will pose a serious threat to you: once inside, the door will be locked and you will have to face first 4 Guards. Once the Guards are dead, 4 Omnicannons will spawn. Once the Omnicannons are destroyed you will have to face 2 Heavy Drones. At the same time in a small room without cover. Good luck with that.

After dealing with those exit to the left and head to the top of the room. On your way up, 8 Omnicannons will attack you. Exit this room through the hatch at the top and you will find a checkpoint in the room to your left. Then head through the 1-way door for the final fight of the Facility (which is way easier than the 2 Heavy Drones room but has a banger of a song). You will have to kill 1 Scientist, 1 Guard and 1 Hyotl captain. The Hyotl wield a gun and is way healthier than the Guards, but he shouldn't be to hard to deal with. After a certain time, 2 Twiguns and 2 Omnicannons will spawn in the room. Once everything is dead, exit to the right and you will reach the last room of the dungeon. There you will find 4 Ancient Essence dispensers, the diamond pedestal to turn in the quest, the Light Beam inside the cupboard and the teleporter to exit the dungeon. You may also notice a locked door to the right...

Secrets
The Facility hides a secret room with a few extra chests. You will also find a locked door in the last room of the dungeon. This page will guide you to these rooms.