Blood drain

 When touching a creature of flesh a tether is formed between the caster and the target. 

While the tether persists:

• Use your bonus action to deal the target 1d12 necrotic damage as blood is siphoned from the target.
• The caster regain hit points equal to half the necrotic damage dealt by this effect (rounded down).
• The tether ends early if the target moves more than 5 feet away from you or if you lose concentration.
• While the tether is active, the affected target and your speed is reduced by 10 feet as the weapon latch onto the flesh of the target.
• Only one creature can be affected by this property at a time.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the initial damage increases by 1d12 for each slot level above 2st.