What went wrong:
I am just placing down Umbral Blades and not recalling them (Which with my perks requires me to use Shift to do so). I then walk to get the Mob’s attention so it walks towards me and have them walk over the blades… They take damage and in this case instantly die.
I am not sure if this is intended or not… its neat because I can get two pretty good stacks if I can anticipate their movement but figured I should let someone know.
Quick video of it (no audio) Insta death