This is a build for solo greater rift progression with mid 70 capability. It requires heavy fishing for density and open map tiles like silver spire, arreat crater, act 2 sand map, ect. with good progression/small hit box mobs that are stackable. The idea is to keep pulling mobs with ancient spear until your physical convention of elements ring buff is up, pre-apply falter and strong arms debuff with ancient spear and whirlwind for 5 seconds during the convention of elements physical buff. When you get large density on an open tile it maybe become worth it to stop and fight in place as you can have a hard time pulling 100's of mobs within a reasonable pace. Try to stay on top of elites/blues when inside density as you will get elite damage that will also spread to whites through area damage. Only kill blues if you have white mob density to kill them in. Pain enhancer will get you over 10 dust devils per second in good density rifts. Bosses can be a little tricky as you won't have perma wrath of the berserker and any kiter bosses are usually a reset. Expect good bosses to take 3-5 minutes, bad ones can take 10.