Necromancy is one of those things, alongside elves, dwarves and elementals, that I wanted to avoid in Mizahar for several reasons, but especially because it tends to encompass so many things. Undead, spirits, demons, death, negativity, pain, and anything dark. Our skills are quite narrow in comparison, though the XP system makes it easier to advance in several skills at the same time.
That said, you can replicate some effects of necromancy in our magic system, at least visually.
Spiritism, as Goss said, lets you fight and use ghosts to your advantage, as well as other undead at high levels.
Animation animates non-living things. It is generally used to make golems, though it works on bodies just fine. In fact, the earliest Animators mainly worked on corpses, which led to a lot of social stigma against them before it turned into an accepted discipline. Many Animators won't animate corpses these days, though some still do. If you want golems with joints, bodies are a valid choice. They are NOT animated by spirits, though. They are closer to Artificial Intelligences.
Animation can also bind souls to objects at Master level - that's how the Nuit undead came to be.
Note: there is no spirit world in Mizahar. There are no 'hells', either, though some gods can definitely have monstrous minions that would look demonic indeed.
I actually have plans for a Summonable alien world with a ghoul-like disease agent that warps life.
So, as you can see, you can do Necromancer-like things... just not with "Necromancy".