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As stated by Mox and Bradford on the Lost and Abandoned mission, the ADVENT Purifier is an enemy unit that was primarily meant for eliminating the Lost. However, this is rarely ever the case. More often than not, they prioritize XCOM units on "The Lost" SITREP missions, and never seem to be able to efficiently use their flamethrowers when they do fight the Lost. On this occasion, the continent bonus, "Double Agent" gave me an Elite Purifier to use on a rescue mission. Normally, it can only give either troopers or stun lancers, but this mod revamps that to allow all ADVENT units to be available for use: https://steamcommunity.com/sharedfiles/filedetails/?id=1127856855