I havent played in a few months but I remade my Decay Lich from 1>93 last I played and think its one of the strongest builds in the game still and thematically the best made class due to the HP drain and constant need to leech hp
I dont use transplant, dont need it. I use Deathseal which procs Hungering Souls, dmg reduction and Channel Wandering Spirits manually against tanky rares/bosses
Wandering Spirits ‘nerf’ wasnt a nerf at all, it was a gigantic buff at the cost of autocasting which is actually replaced by Hungering auto procs anyway
The build becomes so tanky with Deathseal/Titan Heart/Endurance 60%, as long as you have the Threshold to match your 33% you are permanently taking massively less damage and even having 700hp available, you basically rarely get taken out of Reaper because of the endless recovery from perpetual dots applied to everything
edit: on my setup if I am leeching constantly I can remain in Reaper Form for minutes, theres no monolith thats too long and you wont fight a boss so long your form drops unless you didnt resummon into right before the boss, thats why I dont use transplant because if I leave Reaper form im 95% dead anyway