Bloodblade

You evoke a glistening crimson blade of living blood in your hand. Roll a number of hit dice equal to the spell slot level you cast this spell at. Your maximum hit point total is reduced by that many hit points until the spell ends. The blade lasts until the spell ends. It counts as a simple melee weapon with which you
are proficient. On a hit, it deals 1d8 necrotic damage for each hit die you rolled to create it, and has the finesse, light, and reach properties.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you may use your spellcasting modifier for attack and damage rolls with the blade, and it no longer requires Concentration.