I think it makes sense that people play the nightfalls like that. If you wipe it's done, all progress erased- people are going to pretty quickly start playing ultra conservatively and using everything they can to not die and get the rewards.
Summoning pits was probably the worst in a while- Arc burn with witches, thralls, knights and some acolytes throwing arc? Absolutely unforgiving and almost necessitates hanging at the entrance.
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You forgot about the exploding Thralls that do arc damage when they explode and the fact that the already "light switched" Thrall does arc damage with their melee. Basically 75% of ONE type of enemy doesn't have an attack that gives bonus damage. This was the hardest Nightfall yet.
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Thunderlord absolutely wreaked this weeks nightfall.
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Yeah I had a zombie apocalypse with Arc, I'd imagine it would be similar (but thunderlord would be better.)