School of Ectomancy

At the intersection of science and arcane study is the school of Ectomancy. Astute mages have learned to draw on the innate energy contained in Death to empower their spells. Using the latent spiritual energy in bodily and ghostly remains, wizards can bypass many of the conventional rules of spellcasting while also gaining unique benefits. As this school relies on a rather practical usage of bodily and spiritual remains it is often looked down upon by more respectable societies. It is often perceived as black magic and, if found out, could result in the expulsion or even persecution of the wizard who practices it.

Aura of Ghosts

When you gain this School at 2nd level, you surround yourself with arcane energy and wayward spirits swirl and slowly encircle you. As an action you can create the aura around you. When you are dealt damage from a weapon or spell attack, you can use your reaction to send a mindless spirit at the attacker, dealing 1d6 force damage. The aura lasts for 5 minutes or until you dismiss it as a bonus action. You can use this feature a number of times equal to your Intelligence modifier (minimum 1). You regain all uses of this feature after you finish a long rest..

Spell Resurrection

When a creature you have summoned with a spell slot dies you regain one spell slot of a level lower than the one used to summon the creature killed. For example; If you summon a creature using a 4th level spell slot, you can regain one spell slot from level 1 to 3 when the summoned creature dies. If a summoned creature is dismissed or dispelled you do not regain any spell slots. 

You can do this twice per long rest. 

Ghostly Mantle

Starting at 6th level, you can create a mantle of ghostly ectoplasmic energy that drapes across your shoulders and is imbued with powerful magic. The mantle must be on your body for the effect to take effect, or it can be placed on another creature for their use. The mantle takes 8 hours to create. When you create it, choose one of the following options: Resilience. When you create the mantle, choose an elemental damage type. You gain resistance to spells and effects that deal damage of this type. As an action you can change the damage type once per long rest. Recuperation. As an action you can draw on the ghostly energy of the mantle to regain Hit Points equal to 1d6 per wizard level. Once you use this feature, you must finish a long rest before using it again. Remedy. You can use the mantle to cleanse your body. As an action, you can choose 1 disease, poison, or physical ailment to cure. Once you use this feature you must finish a short or long rest before using it again. Retaliation. The mantle grants you additional potency for your spells. When you make a spell attack against a target you can add 1d4 force damage as a lost soul melds with the spell’s effects. This damage increases to 2d4 at 10th level, 3d4 at 14th level, and 4d4 at 18th level. The mantle’s effect lasts until it is separated from its holder for more than 1 minute. You can also dispel the effect from the mantle as a bonus action. If you create a new mantle, the previous one vanishes. 

Osteomancy

Starting at 10th level, you can influence your spells with the bones, creating new effects. When you cast a spell that does damage, you can choose to change the damage type to piercing as the spells effect is convert to shards and spears of bone. Spells modified by this feature also deal an additional 2d6 piercing damage. This damage increases to 4d6 at 14th level, and 6d6 at 18th level.

Necromantic Explosion

Starting at 14th level, you can release the energy of your Aura of Ghosts in a single, devastating blast. As an action, you cause the energy and ghosts in your aura to burst outward. All creatures within 30 feet of you must make a Dexterity saving throw against your spell save DC. On a failure, a creature takes 6d6 force damage, and half as much on a success. This feature consumes your Aura of Ghosts immediately.