The necromancer has a new structure - the evil shrine. Any necromancer with a shrine will gain more skeletons from battle. This doesn't make the necromancer that much better as skeletons aren't too powerful. Where the designers have slipped up is with the addition of ghosts. You can buy ghosts at a barrow mound for about 500 gold each.
Every creature killed by a ghost becomes a ghost.
Cast a steelskin spell on them and you're well away. This feature makes the maps with barrow mounds in them rather farcical, should you choose to make use of them. The new water elemental creature is for hire. The barriers and tents are interesting. As a designer you now have a way to force a player to visit one place before being able to pass through another place.