Necromancers aren't very useful for their health degen. Since it is capped, and enemies later on have ways of circumventing it that it really doesn't matter. If you go and make a Necromancer, generally you're there for excellent utility and buffs, occasionally a damage dealer (which is very good still, just that there's options more valuable to the average party) in the form of the Curse line of hexes or a minion master if there isn't a Hero as one. PvP, they're generally able to find some way of being decent for whatever utility and pressure they can deal, including some degeneration.
Dervishes underwent a massive overhaul. They are now extremely strong in both PvP and PvE, capable of utility, pressure, healing, and straight up damage. Such a class is currently flavor of the month, but for good reason. They make most of the game a joke once you understand the mechanics behind the class, and are capable of fulfilling a variety of roles rather well. I would recommend a Dervish for PvE at the least, as they're capable of fulfilling far more options as a player and still being efficient + wanted in general play. Due to heroes' bad AI regarding melee combat, you aren't to be replaced by a NPC anytime soon either (which is the main issue with Necromancers, sadly. Beyond Order of Undeath minion mastering and spamming Mark of Pain and other hexes with the help of an Assassin elite there is little a hero can't do as good if not better.)
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