Mine has been in "The Summoning Pits" on Moon, called "The Untamed". Ridiculous health, constant high damage beams and never resting minion waves. It's not impossible, but if you get there low level and no back-up, better say your prayers haha
So, what's your most hated boss nemesis?
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Crota because only one person can do damage an I don't like trusting others to do my dirty work