I just ran the Scourge of Winter from start to finish and Draksis just dropped 2 exotic and 1 blue engrams in one kill. I have never seen any boss drop more than 1 exotic engram, let alone 3 engrams at once. I have video footage as proof. Let me know if y'all gotten more than 1 exotic from 1 kill before.
*Skip to 1:37 on the video to get to the engram drops*
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Two exotics and a legendary from the summoning pits on the moon.