I just hit the 30s on my necro. Running staff/scepter/warhorn.
I took 10 pts to get wells targetable and 10 to increase speed in DS 25%
Slots are the wells that pulse dmg and spectral walk.
I stay alive for hours using Swarm and Spectral walk to stay fast and keep and close distance against zergs. Spectral walk is the best infiltration tool in the game. I use it to jump down on zergs, pop off 2-3 on staff and the two wells then return back to where I jumped.
I choose scepter because of the aoe cc on 2 and the kill move on 3. Just tab to someone who has conditions stacked and it does a lot!
Using spectral walk all the time really gives the mobility necro needs to attack from diff angles in WvW.. I don’t see how anyone plays without it. The 30 sec swiftness alone is worth it.