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Expansion
First campaign, involves the invasion of the Last City by the Red Legion.
The Red War
First expansion, involves a journey into the Infinite Forest to save Osiris, the legendary Warlock and Ikora's former mentor
Curse of Osiris
Second expansion involving Mars, the AI Rasputin, and Xol.
Warmind
Third expansion, known as Destiny 2's greatest expansion. Introduced a lot of new content, and revolves around the death of Cayde-6 and the Guardian's thirst for vengeance.
Forsaken
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Expansion
Involves the resurfacing of Eris Morn and a sudden Hive presence on the Moon. Involves "Nightmares" of the Guardian's past.
Shadowkeep
The latest expansion, revolves around the frozen moon of Europa. The Guardian must journey there to combat the Darkness and the machinations of Xivu Arath, sister of Oryx.
Beyond Light
Unknown details, second in the 'Darkness Trilogy' that presumably revolves around Xivu Arath.
The Witch-Queen
The final expansion in the Darkness trilogy. Details unknown. Very foreboding title.