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Title: Diablo IV - The Gathering Legions World Event
Description:
The Gathering Legions is a world event where multiple players have to cooperate in order to succeed. The finish with mastery you need the kill three Servants of Hell within the time frame. These spawn after multiple groups of normal enemies have been defeated. Finally a boss (the Overlord) spawns which you also have to beat within a limited time frame. I was in the event in the Dilapidated Aqueducts zone in the Kehjistan region.

Link: https://www.digioso.com/d4_gathering_legions