TL;DNR Memento Morti does not work for the shadow damage increase on sacrificing reapers.
I am playing a shadow necromancer build and have picked Memento Morti in combo with sacrificing reapers for 15% shadow damage (as well as ice mages for + vuln dam). I am also running Sacrificial Aspect for the synergy (15% increase sacrificed value).
Here is the issue: Morti gives me 0 value on the shadow damage % increase. I proved this by putting on my Sacrificial aspect and taking it off, my damage goes from 15% to 17% for shadow as it should. However when I take off the Momento Morti my shadow damage done on the character sheet remains the same- and does not behave like Sacrifical Aspect. I have logged out and in, etc. still no change. I am not sure if this is a UI bug or if its actual impacting my character so I will continue testing. Kind of annoying, since its 4 skill points its a lot to invest into a build- really just want to know if its working or not so I can move on to other builds or stay. Is anyone else having an issue with this skill point?