Personally I would say that all need some sort of different build, depending on the type of game play.
In terms of WvW zerging I would say wells would still do well due to the combination of AoE damage and life siphoning. To the best of my knowledge, this Well build will be close to what most zerg well necro’s are using. In case you wanna play Reaper, I’ve seen some video’s where people are switching Soul Reaping for Reaper which is something you can try and check for yourself. In the case of base necro you will be more of a backline necro, dealing damage with your wells and with Life Blast, which is why you need Unyielding Blast as it allows Life Blast to pierce up to 5 targets. In the case of Reaper you could go for Blighter’s Boon which will give you some more defensive abilities.
You will notice I used Spite and not Death Magic. In terms of WvW zerging, I would use Spite for 2 reasons. First of all in will allow you to deal more damage, which is in WvW zerging a bit the role of a well necro. And if you would play Reaper, instead of base Necro with Soul Reaping, Spite will give you more in return due to Blighter’s Boon as it will give you Might stacks, allowing you to easily gain LF or health. If you would however have problems with the conditions you are receiving, you can always consider dropping Well of Blood and using consume conditions.
In terms of PvP, I personally wouldn’t be using Wells. Wells are really powerful, don’t get me wrong, but due to the fact that wells are static when placed and other people can easily run out of them (which is different from WvW zerging) I personally would recommend a different build for PvP. As your build contained a Reaper and you said you’re searching for a ‘non dagger’ build I would recommend a build I’ve been using myself lately that uses both Reaper and Axe. I’m not going to say that it’s good against every build or for every situation, but I’m quite happy about it.
Again you will notice a few differences with your initial build. The most common are that I’m using Spite again, for reasons I mentioned earlier and in the case of PvP also for Chill of Death, but also Soul reaping. In PvP, most certainly for a power build, I would say that at this moment Soul Reaping is kinda mandatory for a power Necro/Reaper due to the need of Vital Persistance. Certainly when being in Reaper Shroud, you will need to fight at close range, meaning you will receive quite some damage. As Vital Persistance decrease your LF drain while in Reaper Shroud by 50%, this is a trait that is unfortunately quite needed in order to both allow you to use Reaper Shroud for dealing damage, as well as allowing you to take some damage.
As I haven’t been doing WvW roaming in quite some time, I would say you rather ask someone else about. I’ve there are people who disagree with what I’ve said or who have questions about what I’ve said, feel free to say so.
q*and correct my build thxxx