Yeah, did Necrotic Wake about 15 times between all 3 difficulties and never saw the Deathmaker power drop for any Warrior.
This shit's my only big annoyance with SL thus far. Wasn't the point of the Runecrafting system to reduce RNG?
it does remove the largest part of the rng: where to get it. its not like they were going to let you kill it once and get it. besides, the chances are higher in m+. we have only had trivial difficulties in these first 2 weeks.