Is it possible to do a 35 PoE with a level 33?
Nope.
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By the way, if the team doesnt' have at least 2 snipers 365 with an impact at least equal to LDR, it's pretty much impossible to down Skolas before dismantling the mines.
With 3 high impact snipers, it's easy peasy (as long as you're precise enough of course).