WvW Gear / Armor
If you like condis, go dire and substitute rabid until you find your sweet spot for survivability.
All classes, level 80
Dropbear Massacre, Necro Main
If you want to be a condition damage you can try to use scepter/dagger(or focus) and staff, then use Fear on all the ways you can. (condition damage increase the traited fear damage).
But actually in www the necro have another role: the Cannon!
With a Power build like 6/2/0/0/6 and a zerk equipment (with valkyrie, knight or soldier armor if you want more defence. I sue valkyrie) with Staff and Axe/X.
Then you have to full your DS bar, then when you go in DS you crit with every hit (80% or more critical rate) with a piercing shot for 4k of damage.
About rune, you can use Strength, Pact, Hoelbrak, Rage (depending on how much you can spend).
About sigil you can use Fire, Air, Energy, etc depending on what you want to do (I use fire and air to increase the damage).
Heal skill: Consume Conditions
Utility skills: Well of Corruption, Well of Suffering and a utility at your choice.
I think that you can find that build on Metabattle.
That’s a very good build and make you able to deal very high damage. But you’re a backline player, if you go in the frontline you fall quickly.
IF you are running in the Zerg, your commander will probably want you running Pvt power/wells.
Or go toughness and use it to boost your power from Deadly strength in death magic. Use armor knight/cavalier dagger/warhorn + staff, it’s a power build and you’ll be able to tank too.