Blood Magic: Disciple of the new Maleficarum

You are or were a student at the new Maleficarum where blood magic is now practiced under more ethical standards

Because of these arcane teachings you gain the following benefits:

• You gain resistance to necrotic damage. If you already have resistance to this damage type, you can roll 1d6 and subtract it from the total amount of necrotic damage taken.
• As part of the action of casting a spell, you can empower your magic to deadly effect at the cost of your own health.
• Once per long rest, you can perform a ritual to restore a spell slot that you have expended at the cost of your own health.