The Murex Raid is a new mission that has been added to Warframe for Operation Scarlet Spear. This involves using your Railjack to attack Sentient ships, boarding, and downloading destruction codes to interfere with the ship's progress through the system.
How to play Murex Raid
To start the Murex raid, head to the Scarlet Spear node on Earth, then make sure you have an OpLink from Little Duck. Go to the yellow console on the left side of the room. Interact with him and choose whether you want to start a new team using your Railjack, or join an existing team.
The Murex Raid is pretty straightforward, but there are a few ways to make it a simple mission to complete.
On your first load, you'll need to fly the Railjack to the waypoint to set up the Kill Code transponder, and when it's in place, you'll be able to fly your ship directly in front of the Sentient ship, through the large hole. in the front. This will protect the Railjack from enemy ships. A squad member must remain on the ship to deal with the borders and make the necessary repairs.
The other three should be heading towards the Sentient ship through the door which will now be directly in front of your Railjack.
Once on board the Sentient ship, follow the Waypoint and set up your OpLinks using your cogwheel. You will have to defend them against waves of sentient enemies as they attempt to destroy the OpLinks.
The OpLinks will download nine Destruction Codes, which will be sent by other players performing the Ground Assault mission. This happens automatically, once your OpLinks are configured.
Limbo can make this part of the mission trivial, using Cataclysm and freezing enemies in place as soon as they enter the sphere.
Once all of the destruction codes have been sent, you'll automatically be sent back to the Railjack, and it's just a matter of repeating the process for as many Murex ships as possible.
Always have a crew member on the Railjack to deal with enemies, as the Grineer and Sentient troops will attempt to board the ship. After that, it's just a matter of defending the OpLinks, which will be very easy with Warframes like Limbo, Gara, and Frost.