There's not much of a welcome party as Ryder and co head to the Nexus and find the place to be pretty empty. What's up with that. Play on (and follow our guide) to find out.
Now Ryder is Pathfinder (hopefully that didn't come as too much of a shock) it's time to say hi to some people. This is essentially the point of the Nexus Reunion mission, but there doesn't appear to be many people around.
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First off you'll need to get the Nexus, so use the tram to travel there alongside Liam and Cora. On arriving there's no welcome party whatsoever, with the room more or less completely deserted. There are no lights on either. A Virtual Intelligence bot can be spoken to in order to get information on various Nexus policies. She'll malfunction when you end the conversation, suggesting things aren't brilliant here.
A maintenance man is fixing something down on the platform below. Talk to him to get more backstory about what's going on, including the revelation that everyone thought the Hyperion had been lost or captured. You'll then meet Kandros, leader of the Militia on the Nexus. He'll confirm what the maintenance man was saying, adding that the Hyperion is the first ark they've seen and they'd all but given hope of finding any.
Finish talking to Kandros and then take the tram to Nexus Operations. You'll get more stories about the state of the Nexus and then meet Director Tann, the leader of the Andromeda Initiative, and Foster Addison, who oversees Colonial Affairs.
This mission isn't much more than saying hi and accessing a terminal. If you're on the Nexus you need to head over to the Militia office (if you're onboard the Tempest ship, use a vidcon). You'll find Kandros there, stood next to a terminal. Talk to him about Strike Team missions and he'll point you towards the terminal.
Interact with the terminal and (providing you're online at the time) you'll get the online Strike Team menu. There's no need to actually take part in any multiplayer missions at this stage, with the mission completing as soon as you use the terminal.
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That's Nexus Reunion finished. No on to bigger and more challenging missions.