Shout out to @ballis power leveling me. Thanks man
As for the GR45 no set gear, I really think I either didn't have the proper gear or have no idea how to do it on barb. I tried about 6 times, and always summoned the rift guardian, but due to death timers or just lack of dps, I never made it.
I 1 shot the achievement with a thorns crusader. I literally slapped on random thorns gear, made a max level yellow gem, and threw on my other legendary gems (but swapped out esoteric for thorns). It was so easy never playing the build once. For those of you who need to do this conquest, crusader is the way to go.
I didn't even have the mortal drama for the cube. I just used the furnace.
Thing is, I've been finding it harder to find a reason to push GRs. The lack of finding gear upgrades anymore is getting to me, and slowly grinding paragon levels is unfun. I've spent probably over 1k souls now rerolling a weapon to get ancient, and then another 500 on my fire immunity amulet (to maybe get something decent). I am starved on mats, doing bounties over and over is dreadful.
Part of me wished that the LoN stayed super op, would have pushed the idea of different builds perhaps? I didn't play PTR, so it's kind of bland that some classes just have a one and end all spec that you always do solo. Pretty much on my barb, I'm always IK/Raekor, switch rings/leg gems for move speed if doing bounties.