If you are wondering if the Oppressive Darkness seasonal mod will return to Destiny 2 Witch Queen, it's unknown. In short, there hasn't been any announcement or information regarding the mod's potential return in the upcoming expansion.
The Oppressive Darkness seasonal mod wasn't in the recent news post, A Closer Look at Void 3.0, on Bungie's official website. However, an Echo of Undermining fragment that causes Void grenades to weaken enemies was mentioned.
Related: Everything we know about Void 3.0 abilities in Destiny 2
Echo of Undermining sounds almost identical to what Oppressive Darkness did in Destiny 2, which caused Void grenades to weaken enemies. We speculate that this is how Oppressive Darkness will be re-added to the game, not as a mod but as a new Void Class fragment. But this is not confirmed, so don't take it at face value.
Nonetheless, you will be able to see for yourself if Echo of Undermining is the new Oppressive Darkness on launch day. If you played the game before the new expansion, you will have access to most Fragments. But, new players will need to earn Fragments like Echo of Undermining as they play the Witch Queen expansion.
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