A new subclass, destination, and info on the next season have seemingly leaked before today's Destiny 2 showcase

In advance of the upcoming Destiny 2 showcase later on today, lots of Lightfall images have surfaced via the Destiny 2 leaks discord. Before we start, though, if you don't want to see any spoilers for Lightfall or Season 18, which also starts later today, you should probably leave now...
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