You've learned to infuse your attacks with necrotic energy. You gain the following benefits:
- Once per turn, when you hit a creature with a weapon attack, you can deal an extra 1d6 necrotic damage.
- When you deal necrotic damage, you regain hit points equal to half the necrotic damage dealt (rounded down). You can regain hit points this way a number of times equal to your proficiency bonus per long rest.