Oh god, i saw the twinlit dungeon once and crapped my pants, and im pretty confident with most if not all legendaries now, including collab-universe,paradise,etc modes (though eff that batman one, seriously, wtf). But yeah, iirc twinlit was something like FIGHT 2 HERA-IS' AT THE SAME TIME! (In terms of constant 20k damage per turn for millions of hp), im kinda inclined to believe imma never do that qq.
Edit: hmm, maybe its remotely possible with 2 max skilled ecchis, and 2 devil venus/arch hades leads. Remember their leader skills got buffed to 55% reduction.
Still though, you'll have to spike past their 20% phase, and those arently really spikey leads.