Easiest way...In PvP, couple yourself with a supportive/bunker Engi, Ele, or Druid and don't just look away and button mash. Necros can survive a long time (even without support) with effective kiting and management of Shroud. More challenging way: There are quite a few builds that can help you survive engagements, but against some builds/professions (rightfully so), it can get challenging. Learning to fight those challenges obviously takes practice, just mashing your skills all at once isn't the way to survive. Time it. They had some changes over the years but they are still very sustainable in PvP when not outnumbered too much. Along with their damage output, that's why in PvP these days, people try to focus the necro and take them out of the equation as soon as possible. This is how it feels sometimes: