Vampiric Blade

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects, and life is siphoned from their wound, dealing necrotic damage equal to your spellcasting modifier. You gain temporary hit points equal to the necrotic damage dealt to them.
This spell's effects increase when you reach higher levels. The melee attack deals an additional 1d8 necrotic damage to the target at 5th, 11th, and 17th level.