Mass Effect: Styx Theta - Uncharted World walkthrough Mass Effect Guide

Last update: 18 May 2021

13.14. Styx Theta

This cluster unlocks after completing main plot mission on Noveria (7).

13.14.1. Acheron System

Planet	Explorable	Surveyable	Collectibles
Altahe	yes	no	Rare earths, heavy metals, asari writings
Carbonaceus asteroid (hidden)	no	yes	Turian insignias
Grosalgen	no	yes	Light metals
Farthorl	no	no	-
Imaneya	no	no	-

13.14.1.1. Altahe

Planet Altahe 1. Rare earths 2. Escape pod 3. Heavy metals 4. Asari writings 5. Listening post (Listening post Theta).

Listening post Theta

Hint! This assignment can be done only after completing mission on Noveria (7).

You'll get this assignment by entering Acheron system or by talking with lt. Durand while completing assignment 13.14.2.1. Listening post Alpha.

Prepare your squad to fight rachnii. After landing on Altahe head to the listening post (Altahe - 5).

There will be some rachnii outside it. Eliminate them without leaving Mako. The rest of opponents will spew from nearby holes. After killing them enter the building. You'll encounter more rachnii.

In the room on the south west you'll find the terminal. Access it to learn the coordinates of place from where rachnii shipments were sent.

Hint! If you didn't complete assignment 13.14.2.1. Listening post Alpha before, you'll hear the call for help sent by lt. Durand.

13.14.2. Erebus System

Planet	Explorable	Surveyable	Collectibles
Nepmos	yes	no	Light metals, heavy metals, rare earths, League medallion
Quaji	no	yes	Light metals
Wermani	no	yes	Prothean data disc
Chofen	no	no	-

13.14.2.1. Nepmos

Planet Nepmos 1. Abandoned mining camp 2. Rare earths 3. League medallion 4. Heavy metal 5. Crashed probe 6. Rachnii infested mine (Listening post Alfa) 7. Light metal 8. Listening post (Listening post Alfa)

Listening post Alfa

Hint! This assignment can be done only after completing mission on Noveria (7).

You'll get this mission after entering Ereb system or by receiving the call on Altahe (13.14.1.1. Listening post Theta).

Land on Nepmos and head to the listening post (Nepmos - 8). You'll find a group of Alliance soldiers pinned down by legions of rachnii. Your task is to help them defend themselves.

Hint! You can make it easier by hooking up Mako's power supply to nearby generator. This way you'll reactivate the turrets.

After dealing with third wave of enemies you can talk with lt. Durand to learn the coordinates of second listening post and to activate assignment 13.14.1.1. Listening post Theta.

Your next task will be to clear nearby mine infested by rachnii. Go there (Nepmos - 6) and enter inside. You'll be attacked by rachnii. It's best to retreat to the entrance and eliminate the enemies gradually (there will be a lot of them).

Then you'll have to kill two powerful and strong rachnii warriors, each supported by four soldiers. You'll find them in rooms on the north and the north east of the mine. After clearing the mine, assignment will be completed.