Reaper and the lore
Those Reapers are tied to Grenth. The necromancer is closely tied to the idea of Grenth (not all worship him, but the idea of what he stands for has presence across the world nontheless). The connection I’m thinking they will make is perhaps a very loose one that the new fighting style was based around stories of the Reapers. And since Marjori is likely the first Reaper, she knows all about Grenth as a human.
Sure there is, at least for the concept of the specialization, not necessarily with the lore.
Necros are tied to death magic and most human necros favor Grenth, so have a connection is quite likely.
(and the other 8 elite specs maxed too)
I personally don’t think it will have much if any relevance to Grenth. Just because the idea of the human gods only appeals to humans, which is pointless when theres 5 races involved.
Take the Revenant for instance. Its essentially a reincarnation of the Ritualist, but without the “human gods” motif. I think it’ll be something similar with Reaper. I think it will just be an extension of the Necromancer’s power. Maybe something really upsets Jory, and shes goes a bit “movie monster”, turning into a Reaper.