school of Necromantic battlewizardry

You use your necromancy to wade into batlle

Necromancy Savant

Beginning when you select this school at 2nd level, the gold and time you must spend to copy a necromancy spell into your spellbook is halved.

life manipulation

At 2nd level, you gain the ability to use your life force to harm others, as a bonus action you can take 1d6 of necrotic dmg (cannot be negated or reduced) to add 2d6 necrotic dmg to the damage of a necromancy spell  

Necrotic combatant

At 6th level, you add the vampiric touch spell to your spellbook if it is not there already. When you cast vampiric touch, you do not require concentration, Additionally you can choose to heal any undead within 30 ft instead of yourself 

 

Inured to Undeath/life manipulation

Beginning at 10th level, you have resistance to necrotic damage, and your hit point maximum can’t be reduced. You have spent so much time dealing with undead and the forces that animate them that you have become inured to some of their worst effects. in addition you can now choose to deal 2 d6 necrotic dmg to yourself with your life manipulation feature adding an additional 2 d6 necrotic damage with your grim harvest feature

corpse armor

Starting at 14th level, you can use your control over the dead to manifest a spectral bone armor granting you  resistance to piercing, slashing and bludgeoning damage and increasing your speed by 2O ft and increasing the damage of any necrotic spell by 2 d6 

you use this feature once per long rest unless you take 4d6 necrotic damage to do so again, increasing the damage by 2d6 for each subsequent time