its really important to force them to charge you, as then they have to fight 2 rounds of combat before they can raise troops again. the new bubble versions of van hels, invo, and vigor are really nasty, van hels is 12+ to cast on the bigger version and needs to be stopped at all costs. the black periapt is really good, level 4 necromancers are really difficult to handle in general. they're cheap enough to have a dedicated level 4 caster and a combat vampire lord (who can be much tougher than the old book, holy crap this guy was mean). lore attribute makes it really tough to kill their characters if they stay around the necro so the bunker has to go down ASAP. i was using my daemons so his spirit hosts weren't that bad but they are going to be a real problem for other armies (my beastmen or ogres for example). raise dead is an extremely good spell, they can raise a re director anywhere within 18" and grow it really big in a phase or 2.
lots of good stuff, pretty excited to play em again.