For me, it's The Shadow Thief, The Bond Brothers, The Sunless Cell, Undying mind, and Dust Palace. I do get the Fallen S.A.B.E.R. one, but people quit once I pull out my sparrow.
Also for 2 rare times, I played Cerberus Vae 3, the year one strike for the Heroic Strike. It was fun as heck fighting the giant, invisible Minotaur where the Tank usually lands.
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Why are you doing heroic strikes? They have the same drop rate as regular strikes.