Minecraft version: 1.20.1
Blood Magic version: 3.3.5-47
Animus version: 3.0.10
Malum version: 1.20.1-1.6.7
Despite killing countless eligible mobs with the Runic Sentient Scythe and getting plenty of spirit drops from them, I have not gotten a single Rotting Essence, Grim Talc, Warp Flux etc. to drop. I thought this was a bug with my game or modpack, but no, the moment I killed an enderman with a normal Soulstained Steel Scythe it dropped 2 Warp Flux. I even tried Ars Scalaes' Enchanter's Scythe, and sure enough, that one also makes mobs drop the special stuff, meaning this is an issue with Animus specifically.
Haven't tested the Hand of Death yet as I have not yet progressed that far, but even if it does work, then the Runic Sentient Scythe still has a problem.
Also, the Runic Sentient Scythe doesn't seem to accept Malum's unique scythe enchants (Rebound and Ascension), which I'm sure can't be intentional.