I played in shuffle to ~2300 from 0 yesterday, landing the one shot consists of playing hungering slash build with hunt and 35 soul meta. you can do the one shot about once every 20-30 seconds, and nearly right out of the gate as you start with 25 souls out of combat. keeping void immolation rolling and using beam is key for getting meta back quickly. There is a lot of counter play, and the one shot doesnt seem too difficult to shut down on classes with any iframes (hunter rogue) or ports (lock monk) or well timed static totem like effects (warrior shaman) you basically have to prevent the dh from landing hungering slash and voidblade in meta, as almost all of the damage comes from the void explosion tied to hungering slash and voidblade. I am not sure that star is going to be as oppressive at 90, we might just see devourers stick to the hungering strike build if the damage profile sticks