Crimson Conduit

(Activate Hemocraft must be active):

Expend 2 hit-dice or take 2d8 damage to activate this spell. Upon casting this spell, you channel the raw essence of blood magic, creating a pulsating crimson aura around you that extends in a 30-foot radius. This aura shimmers with malevolent energy and acts as a conduit for your intentions.

Any creature of your choice that starts its turn within the aura or enters it for the first time on a turn must make a Constitution saving throw. On a failed save, the creature takes 4d8 necrotic damage and its movement speed is halved until the start of your next turn. On a successful save, the creature takes half as much damage and suffers no speed reduction.

Additionally, while you maintain concentration on this spell, as a bonus action on each of your turns you can designate one creature within the aura to suffer an additional effect. The targeted creature must make a Constitution saving throw or be afflicted by the "Crimson Affliction" for 1 minute. The Crimson Affliction causes the affected creature to take 1d6 slashing damage at the start of each of its turns as small cuts begin to open all around the target's body. The creature can repeat the saving throw at the end of each of its turns, ending the effect on a success.

Creatures immune to necrotic damage are unaffected by the aura's damage, but they are still subject to the Crimson Affliction if chosen as a target.

At Higher Levels: The spell's damage and effects increase by 1d8 and 1d6 respectively when cast using a spell slot of 5th level or higher.