Cold Reaper. Uses the Drain Essence skill, Blade spirits and Leviathan’ proc as main attacking abilities. The build is extremely simple and consists of 1.5 buttons. We use the Drain Essence skill and cast Ravenous Earth, nothing more is required. On hard bosses turn on the label and if you need a barrier. (Since I have the habit of pressing a lot of buttons, I use a bunch of potions so those places do not stand idle and do not let the fingers forget )
Build without greens: https://www.grimtools.com/calc/p25orglZ
Build with green boots: https://www.grimtools.com/calc/JVlWP752
Queen 6s: https://www.youtube.com/watch?v=FV4kL3_3Hok
150-170 6m 13s: https://www.youtube.com/watch?v=VFmTZgFUXow
You can do less than 6 minutes if you are more fortunate than I and you will not fall for passing 3 Cubicabras, which have 94% resistance to cold and a big recovery, by the way, Cubicabra has all big, well more pleasant modifiers of the horn, and not like me -20% witchcraft speed.