Taste of Blood

The blood of others can heal your wounds. Make a melee spell attack against a creature within your reach. On a hit, the target takes necrotic damage, equal to your hit dice, and you regain hit points equal to the amount of necrotic damage dealt.

After you used this spell, you must take a short or long rest before you can use it again.

At Higher Levels: You may use one additional hit dice for every level above level 1.

Multiclassing: You may choose which classes' hit dice you want to use. You must not use more dice then the level of this class.

Example: You are a wizard lv. 3, rouge lv. 1. You may roll 3D6, because wizards have 1D6 as base hit dice. Or you may use 1D8, because rouges have 1D8 hit dice. In this example, if you choose your wizard class and roll 3+5+1, you deal 9 necrotic damage and regain 9 hit points.