We Came Forth to Contemplate the Stars

A Living Campaign Mission for 2269

From the introduction:

After the events of Bacchus’s Irresistible Call, Admiral Banna Stoker orders the Lexington to investigate the fifth planet around 51 Pegasi that was referenced in the data recovered from Bacchus IV. While exploring the ruins of an ancient structure on the planet, the crew are transported to an impossibly massive space station at the edge of the Milky Way Galaxy. At their arrival point, they are greeted by an alien species who call themselves The Covenant.