We need to find whoever sent that invitation. They need our help.
— Ikora Rey
The Invitation is the first mission in The Edge of Fate, which takes the Guardian and Ghost to the world of Kepler for the first time. This is the introduction to the world, and some of the mechanics and enemies you'll face along the way.
Guide
You'll spawn straight into the world of Kepler, in The Stacks. You'll need to walk down and Rendezvous With Ikora. Follow the path round until your mission updates to Defeat Unidentified Combatant Unit, which will be when a bunch of unidentified Eliksni ambush you in a big open space. Kill all of them to advance forwards.
Continue forward towards the objective marker to meet Ikora. You'll get a transmission from 'Lodi', which will indicate you're going the right way. Once you get to an open area, you'll see a flower-like statue. Kill all the Eliksni in the area, and Ikora will appear. Speak to her.
Once you've spoken to her, you'll be told to Explore the Area.
There will be hole in the wall of the big building behind Ikora, towards the objective marker.
Go forward and through, and turn left, and follow the wall round until you reach a door on the right of the big metal pipes and container. Go through the door and walk towards the terminal, which will have an objective marker.
Interact with it, and you'll have a voice line from VII of the IX. After that, the quest will update to Investigate Structure.
Follow the objective marker and go through the door to the left of the portal. You'll see a little hole in the wall and a staircase.
Go up the staircase and forward, until you're met with a terminal-esque shrine, that says 'Fuse with Dark Matter'.
Interact with it, and you'll transform into a ball of light, unlocking Matterspark.
Roll towards the end of the room and down the staircase, to the hole on the ground. Enter that hole and continue the path down, until you get to a hole on the floor. Jump into that hole and you'll find yourself inside a metal cage.
Jump down to the next level and there will be a Pylon. Spam your attack button to charge up that Pylon, which will open up the cage and let you exit.
Jump down, and you'll instantly have a rally banner on the door to your left. Rally up, and walk through the door.
Inside of the door, you'll be met by the 'Exile Overseer' Servitor boss. Get its healthbar down to halfway, and it will retreat.
Once it's done, your quest will update to Destroy Shields With Pylons, which will need you to destroy two pylons to continue DPS. Clear adds and look for the Matterspark terminal in the middle of the room.
Go into Matterspark and roll towards either one of the objective markers, until you find their holes. One will be on the left side of the room, in a blue pipe. Head up into it.
Inside, there's a terminal to charge. Charge it by spamming your attack button, and head back out.
The other will be on the right side, inside of the side of the building. Roll in, and charge by spamming your attack button.
Come back out, and the boss will be damageable again. Kill it.
Once you've done so, go claim your loot in the chest down below.
Walk forward and drop down behind the chest, and you'll see a Matterspark terminal, a pylon, and and a hole in the door.
Activate Matterspark and charge the pylon to open the door in the hole, then roll through with Matterspark.
When you come out, you'll be greeted by an alert telling you to 'Find Materials'. Walk round the right to the objective marker, and fight adds along the way.
You'll find a more open room with a circular platform a bunch of Eliksni adds in there. Kill those ads and continue round clockwise.
Once inside the caves, take a right towards the debris, and jump your way up to continue following the objective marker.
You'll see a hole on your left, with a grilled plate in front of it. Jump up and continue forward.
In the next room, you'll meet a boss called Crystalline Captain. Kill him, and you'll have to charge three pylons this time (by entering Matterspark).
Find the Matterspark terminal and activate it. The Matterspark is towards the shielded door at the end of the room.
For the first pylon, head to the shielded door and you'll see a little platform to the wall on the left. Jump up it and along.
For the second pylon, head to the right and over the bridge. It'll be over the bridge at the end.
For the last pylon, head over the same bridge and then drop down to the right. You'll see a platform up and around the wall.
Go up that platform and you'll see the pylon, at the end of the path.
Once you've activated all three and the quest has updated to Acquire Acceleron, activate Matterspark one more time and head to the building at the end of the bridge. There will be a hole, head straight down it to collect a chest.
Then, activate Matterspark and continue out of the hole to the left of the Matterspark terminal.
Head to the previously shielded door, which will now be open. Continue through until you see a hole door. Head through that door and left through the tunnels.
Your quest will change to Return to the Mechanism, and you'll enter a room with a Rally Banner and a Matterspark. Rally up, then enter Matterspark and go through the door.
When you head into the room, you'll face a Vessel of the Archon boss. It will have a blue bubble around it, which you'll need to step in to damage it.
Once you've killed it once, there will be two copies of the boss that spawn: one inside the new bubble and one outside.
Kill them both, taking out the one outside the bubble before dealing with the one inside.
Once you've killed both, you'll get a reward chest. Go and grab your rewards.
After a conversation between Ghost and Ikora, you'll see an 'Unusual Vessel' on the floor next to the chest and a prompt to collect it. Interact to collect it.
Head to the mechanism in the middle and interact with it to activate it.
This will enter you into a cutscene in which you meet Lodi, the main character of the expansion.
Once you've finished the cutscene, you'll see the train in front of you. Head through it to continue.
Run to the end of the train and you'll end up in a cave.
Run or Matterspark down and follow the path to the end of the cave and you'll see Lodi, who you can interact with.
Interact with Lodi, and you'll have a conversation with him in which he introduces himself.
Once you've done this, you'll have finished The Invitation and will be able to freely explore the Caldera province of Kepler. Go back to our guide to continue finding out how to complete The Edge of Fate campaign!
