Necro need advice vs teleport/stealth thief.
The issue is probably in your utilities. Your spec is fine. Run it with 6x nightmare, sigil of earth on scepter, corruption on dagger. Sigil of energy on staff….and most importantly…duh duh duh….Bring signet of spite. It is the key to necro burst. Reason why is because it basically applies conditions in duration/variety that it would basically take you 3-4 separate other abilities to replicate, and it does all it in 3/4 sec. So, in a way, it is almost like quickness for a necromancer. Once you land it, you overwhelm certain classes condition removal abilities and you start to quickly exhaust their condition removal as well. For the thief, just land signet of spite, and combo it into a fear chain. He will be on life support within 4-5 seconds.
I helped out Nemesis (the necro who makes the pve/www guides) with some pvp adjustments recently after I saw his threads about necromancer frustations in pvp and he agrees with me now 100%.
I’ve tried that signet before. It works brilliant vs other people. But I can’t land it on my guildie. He is always evading, or porting away, or in stealth. May be I should record a video to better show my issue.