Blood Rush

As part of casting this spell, you must take 1d6 necrotic damage. This damage can not be lowered or negated in anyway. Roll 1d6 and regain a number of hit points equal to double the result + your spellcasting ability modifier

When you cast this spell using a spell slot of 2nd level or higher, you can expend and roll an additional 1d6 for each slot level above 1st.