As first reported by The Game Post, the suit (available to see in full via Scribd) accuses the game company of copyright infringement related to Destiny 2’s 2017 storyline, The Red War.

Martineau, a writer, reckons that Bungie purloined elements of a story he wrote for Destiny 2's Red War storyline (since archived forever, sealed away in the game's odd story vault). Per Martineau ...

The Destiny 2 Red War campaign, the campaign that players engaged with at the launch of the game in 2017, is lost forever according to court filings. The campaign was removed from the game in 2020 ...

Although “Bungie archived the original code… the Red War legacy build can longer run because its outdated code is incompatible with Destiny 2’s evolved underlying operational framework”.