Deathly Crusher

You weave together past souls and make a weapon out of they regret and longing for life. This magic mace lasts until the spell ends. It counts as a simple melee weapon with which you are proficient. It deals 2d10 necrotic damage on a hit and has the heavy, reach, and versatile (2d12 if two handed). In addition, when you use the mace to attack a target that is in under half-hp, you make the attack roll with advantage.

If you drop the weapon, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to cause the mace to reappear in your hand.

At Higher Levels. When you cast this spell using a 3rd- or 4th-level spell slot, the damage increases to 3d10 (3d12). When you cast it using a 5th- or 6th-level spell slot, the damage increases to 4d10 (4d12). When you cast it using a spell slot of 7th level or higher, the damage increases to 5d10 (5d12).