Cele reaper if can't any reaper. If can't, core necro also works.
Use staff
Not only it can solo a lot of stuff it can also tag like crazy. Other classes require to target and atk. Necromancer staff can aoe anywhere in 1200 range with 240 radius, no restrictions, you don't have to turn your character away. Just skill anywhere.
Tired of staff? go into reaper and spin around.
Want to pull enemies? Spectral grasp
signet of locust for movement.
You want more tag? You can use 3 wells on top of 4 staff marks and f1 shroud spin.
You don't even need cele reaper for this, it is just good for perma quickness. Full berserker works fine, staff marks hit 3-8k. You might need to tone down damage for some events.