Esthel's Bloodrage

Choose a willing creature that you can see within range. Until the spell ends, the target deals an additional 1d4 necrotic damage on its attacks, has an advantage on Constitution saving throws, and gains a lifesteal ability. Using lifesteal, you recover hitpoints equal to the necrotic damage you deal on successful attacks against creatures. At the end of the creature's turn, their maximum hitpoints are reduced to their current hitpoints. When their maximum hitpoints are reduced this way, they gain +5 to their attack rolls and damage rolls during their next turn. The maximum hitpoints reduced this way recover when the creature takes a long rest.

Moreover, the additional attack action from Haste can make two weapon attacks instead of one for the target creature under this spell. When the spell ends or the target is unconscious, it cannot be affected by magical healing until after its next turn, as a wave of anemia sweeps over it.