Condition Transfer
Have a few quick condition removals if you don’t feel like investing in sigils. Believe me I hate that kitten too, especially from monsters.
My favorite is Signet of Agility combined with Fleet of Foot and Uncatchable. Since all I use is Bleeds and Cripples, the moment I get my own conditions transferred onto me I use my SoA to cleanse bleeding and then dodge through the necro and reapply Bleeding and Cripple while removing my cripple from me.
Hope this helps a little.
best way to combat necros is to have few conditions yourself and many ways to remove conditions, along with high burst preferrably.
basically, a power/crit build with condition removal.
far as i know, necros still have little in the way of defense.