Familiar Echoes is a side quest in Avatar: Frontiers of Pandora, only available via the season pass. It is a four part mission involving Alexander Tremayne and Anqa Salaam.
Description[]
"Infiltrate a highly secured RDA military base and hack their classified data to sabotage them from the inside."[1]
After Hydro-Oil Extractor Alpha, in the Rising Spires domain of the Kinglor Forest, has been defeated in the quest Pushing Back, Alexander will call the player character at any one of the field labs on the map, and give the main character the first part of the quest. He explains that he has been infiltrating RDA systems and has noticed some concerning data that he needs to take a deeper look at. He tasks the Sarentu with using the Systems Interrogation Device to retrieve data from some communication relays within the abandoned base.
Retrieve the data from the comms relays in Hydro-Oil Extractor Alpha[]
Once the Sarentu is close enough to Hydro-Oil Extractor Alpha, they contact Alex on the radio and inform him that they are near the base. Alex tells the Sarentu to turn on the generator to power up the comms relays, but warns them that they should keep watch for RDA troops. He also tells them that hacking more relays will speed up the data transfer, but only hacking one will complete the transfer as well, just slower.
After hacking a relay, Alex calls on the radio to confirm that the connection has been established and the data is being transferred. He asks that the main character ensure nothing happens to the relay while the data is being transferred. If the main character chooses to hack subsequent relays, Alex calls to comment on the data transfer speeding up. There are three possible relays to hack: Relay A, Relay B, and Relay C.
The data being transferred attracts RDA soldiers that the main character must dispatch, as they will target and destroy the communication relays.