Void Rift Elite - Crimson Guard kicking my butt

Hi, I decided to venture out from the safety of my 100%-cleared Normal mode Void Rift and try to take on Elite mode. I'm about 56% in, and I'm fighting a bunch of white tower dudes, and the Crimson Guards are killing me. You know, they're the ones that float in from the left and right and corrupt tiles so they're unusable.

I've tried a variety of marksmen including Hatssut, Hex, A5 Idril, A5 Maul, A5 Luneria. I can't take them down before they float close enough to start corrupting a tile, and then the game spirals out of control and I get taken out.

I don't have Setram or Silas, so I could use some other ideas. One of the problems with most of those marksmen is that they don't have the range to start hitting them right away, except for Luneria's lord bonus, but that doesn't help Hatssut. Idril's ult is useless, too, because it just targets the big guys at the bottom of the map, and ignores the crimson guards. I've been stuck here for days; please help!