Necromancy, undeath or death magic to some, is the darkest of all magic. Most of the magic in this field of the arcane focuses on the manipulation of the dead and the souls of the living. You wield the darkest of all black magic. Harvesting the leftover parts of the world to reanimate the dead requires three resources that are essential for necromancy: vitae (the life force of humans), the remains of the dead, and entropy. Wielding all three, you cast spells that change the world around you to come closer to death or reanimate those close to death.
You start with beginner-level spells in the three main branches of necromancy however you are not limited to these branches.
Undead manipulation: what most people assume necromancy is all about is being able to raise the dead, whether they be skeletons, zombies, spirits, or just about any other type of undead creature. There is no limit to what you can raise to become part of your undead legion. You may have any number of undead servants at a time, taking no Vitae for them to linger but only what it costs to resurrect them. You gain a mental link with every undead that you create that allows you to assume direct control over them as the overlord of a hivemind of undead minions. So long as they fit within the theme of being undead, you can bring someone back into various forms, such as mummies or vampires that possess abilities similar to their fantasy counterparts, such as a lich being able to resurrect the dead as a general or possessing a phylactery.
Curse manipulation: You are proficient in curses, being able to use many curses that slow, weaken, cause misfortune, Blindness, petrification, Drain energy, and even cause damage to those you curse. All curses you cast are permanent unless the one you cast them on is stronger than you. This magic uses entropy in a more focused fashion than any other branch of necromancy. You start with basic spells such as slow, blinding, and corpse explode.
Soul manipulation: you are able to manipulate souls and the life force of others. Creating and shaping the souls in any way you wish is possible so long as you possess souls, both the ones you are manipulating and the ones you use to feed your energy. To start down the path, you must possess an understanding of your own soul. The more you grow this branch of necromancy, the more you can shape the world around you or absorb the souls of others, creating monsters, converting souls to energy, absorbing them to gain power the person once possessed, creating souls from nothing, even forging souls into armor, and so much more.
At later stages of necromancy, you can even start manipulating those who are not dead, shaping flesh, and creating new species from magic alone, creating abominations from those still alive or dead that are loyal only to you. At mastery, you can even reverse the flow of entropy and instead focus it into your undead creations, evolving them to no longer be dead but instead a half-step between death and life, allowing them to grow past what they once were.