The World Invitation Of The Nine. Complete A Garden World Strike on Mercury. Complete the Corrupted Strike in the Dreaming City.
Once you finish all of those, and "The Garden World" Strike, you can head back to the Derelict for another scene. Spoiler filled cutsceā¦ Invitations of the Nine aimed to channel that with a weekly mini-quest that would give out a piece of powerful loot and a bit of story. Once the first Invitation of the Nine quest is complete, the Guardian can visit the Drifter's Derelict ship (triggered by a mission in the Director under Gambit called "Mystery and Potential").
The World Invitation of the Nine, Rare.
Invitations of the Nine is The World again.
Once you finish all of those, and "The Garden World" Strike, you can head back to the Derelict for another scene. The Nine wants you to kill Hive and Fallen on Titan Go to Mercury, and select A Garden World on the bottom left. Those who have completed all previous Invitation of the Nine bounties will have the Strength bounty waiting for them.