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cwbys21 said:
Mass Effect used UE? What the hell. Why would Bioware have their own engine that they lease out (ex: The Withcer) and then use Unreal to make Mass Effect?

The Witcher used a heavily modified version of Neverwinter Nights 1's old engine (CD Projekt themselves re-wrote 90% of the engine for the Witcher), so Bioware had no choice but to use another engine.