Blood Tendril

A slick crimson tentacle lashes out from you toward a creature, grabbing them, binding them to you, and draining their life. Make a ranged spell attack against that creature. On a hit, the target takes 2d6 necrotic damage, giving you temporary hit points equal to half the damage, and on each of your turns for the duration, you can use your bonus action to deal 2d6 necrotic damage to the target automatically, giving you temporary hit points equal to half the damage.

Additionally, the creature cannot move out of the spell's range, as your are tethered to it. If the creature attempts to move out of the spell's range, it must make a strength Saving throw. On a failed save, it loses half its movement and cannot move away. On a successful save, you must either end the spell or make a Strength saving throw. On a failed save, you are dragged in the direction the creature moves if it moves out of the spell's range. On a successful save, the spell ends.

The spell ends if you use your bonus action to do anything else, or cast a levelled spell with an action or reaction. The spell also ends if the tentacle is severed. The tentacle has an armor class of 10, 12 hit points (which regenerate fully at the beginning of of your turn), and automatically fails any saving throws.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the initial damage increases by 1d6 for each slot level above 1st.