First of all, while not expecting harbinger, the theme has grown on me already and I'm on board!
A few suggestions or general feedback:
1. Visuals: Overall I like the effects a lot. However, I would like the blight visual effect reduced. While I enjoy the visual for low blight stacks, when I sit at 25 stacks as an asura, I can barely see my own character.
2. Elixirs: I understand these things are hard to balance, so giving us stat buttons is understandable, I hope they do get another layer of depth added in the future. Most of the suggestions I have seen overload the kit a bit in my opinion, so I really wouldn't know how to solve this. The imo best suggestion I have seen would be to have elixirs be accesible in shroud but 'flip' to tossing skills.
3. Pistol: The choice for pistol is a bit odd. For 900 range necro already has a condi and a power option. 1200 range wouldve made it the 'sniper' option, but then a rifle or dual pistol couldve worked better perhaps. If you wanted the harbinger to go glass cannon melee, perhaps hammer wouldve been a better choice? (sidenote: please give us hammer next expac so I can finally use sharur).
The pistol does run into the necro offhand issue: none of them are actually that nice to use. Reaper has greatsword and scourge gets torch, so they never truly had to deal with this. (maybe an elixir offhand to toss aoe elixirs?).
4. Shroud: My one issue with the shroud is no stun break while your real health is still at risk. Personally I would be using the elixir of ambition right before going into harbinger shroud to partially solve this with stability. I also understand that mobility is something that lets us avoid certain cc's, but nothing like a targeted stun. Which brings me to my next point:
5. Traits: Middle line: I love that you wanted to give the boonsupport option to us necros, and the middle line seems fine to me. (I read some people wanted the quickness uptime to be a more active thing, which i understand, but it's not an issue for me). About throwing elixirs for the boons, I disagree. With a tanky build and our life force flowing into that healthbar to sustain us, a boonsupport could stay ranged and throw all boons on their allies without risking themselves. This also means they could miss their boons in case their allies blink or dash. Bottom line: The condi line is decent for me too. The only gripe I have, is that the GM forces us to go melee, which does not make much sense with the rest of the kit. The shroud 2 shotgun is a nice reward for being more risky in melee, but pulsing condi in 180 range doesn't feel very good imo.
It's very much like 'we have desert shroud at home', but unlike scourge you can't use your aoe pulses through a sand shade.
Top line: This is just my personal opinion, but I think it should be replaced. We have a decent power option in the reaper spec and I think another traitline that lets harbinger be slightly less glassy or a bit more ranged would be a welcome option. Perhaps letting our shroud 3 or 4 stunbreak, or blight reducing your health by a lower percentage, or a condi GM trait that does less damage than the 180 range pulsing one but lets you play a ranged harbinger as that gunslinger theme (I'm no expert, but seeing the pulses around my character while not standing next to an enemy in open world or world bosses feels bad, because it just reminds me I'm missing out on damage).
Overall, I'm interested to see how the spec ends up and will keep an eye on this thread for other people's ideas!