I mean, yeah balance affinity+thrash, but tbqh Latc+FoN is the best combo for the encounter. I was moonkin mainspec so I had those legendaries, but yeah. Basically if you use moonfire as your main damage ability you never have to worry about getting hit by anything outside of when you need to interrupt. For P1 anyway.
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Interrupting/threating several targets, using cd for annihilate, not standing in poop. Idk seems like dungeon tanking to me.