Soulbinding

You are able to bind willing souls into undead, much like a necromancer.

Soul Strike

Beginning at 2nd level, your necromancy spells can pierce the soul of a creature.  When you cast a necromancy spell of 3rd level or lower that deals necrotic damage, you can cause the spell to deal maximum damage.  Once you use this feature, you can't use it again until you finish a short or long rest.

Bind Soul

Starting at 6th level, you can cause souls of your alignment to fight by your side.  You learn the animate dead spell.  When you cast a spell that creates undead, the undead created by it share your alignment, use souls willing to fight by your side, and have an Intelligence, Wisdom, and Charisma of 10, unless it is already higher.  In addition, they gain temporary hit points equal to your wizard level when they are created.  When the spell that created the undead ends, the undead are free to act as they please, and might attack you, help you, or leave you, depending on how you treated it when it was under your control.

Empower Undead

You can add your Intelligence to the attack and damage rolls of all undead you have created using your necromancy spells.  The undead are immune to any effects that turn undead, and magic that determines a creature's type reveals them to be of the type they were before they died.  The undead you create with your necromancy spells appear living.  As an action, a creature can make an Intelligence (Investigation) check against your spell save DC.  On a success, the creature identifies the creatures as undead.

Master of Souls

Starting at 14th level, you can imbue undead with great power.  Undead you create with necromancy spells have all of their ability scores equal 12, unless they are already higher.  You have a +1 bonus to saving throws for each friendly undead within 10 feet of you.