Conspiracy of Ravens

You summon a flock of spectral ravens to circle above the battlefield. These ravens bestow blessings upon your allies and bring misfortune to your enemies, granting the following effects:

Omen of the White Raven: Choose up to six creatures of your choice within range. Each chosen creature gains the effects of a Bless spell for the duration. When a creature under this effect would drop to 0 hit points, they instead regain 7d8 hit points, and this spell ends for that creature.

Omen of the Black Raven: Choose up to six creatures within range that you can see. Each chosen enemy must make a Charisma saving throw. On a failed save, they suffer the effects of a Bane spell for the duration. In addition, while under this effect, the target takes an additional 1d8 necrotic damage whenever they are dealt damage by an attack. The target can repeat the saving throw at the end of each of their turns, ending the effect on a success.