Season of Dawn
From Destinypedia, the Destiny wiki
The Season of Dawn is the ninth season of Destiny 2 and the successive seasonal content for Shadowkeep after the Season of the Undying. It started on December 10th. The story will consist of The Guardian returning to Mercury to assist Osiris in stopping the Red Legion from changing the past. This season features the appearance of Saint-14, a legendary Guardian who suffered a final death but has somehow been brought back to life.
DEFEND THE TIMELINE: With the Vex Invasion now defeated, Osiris calls upon you to face a new threat. Stop a council of Cabal Psion Flayers from manipulating time and undoing our victory against the Red Legion.