Things I recall from doing it the other day.....
Boss #1- The Crassian Leviathan
fairly sure the beam is poison
I surged down the middle when swapping sides bc Leviathan moved
when he does the head/body slide it makes me think of the Cha-Cha Slide......
Boss #2 - Taraket the Necromancer
I used dominion mines and weapon poison++ when I did story mode and I believvvvve they worked, but I"m having second thoughts about it atm (can't recall if they worked at Ambassador too, but I think it did)