Bone Break

Skuldur's blood magic guides your hands as you temporarily crack apart the bones of one creature you can see within range. The target must make a constitution saving throw. On a failed save, the target takes 4d6 bludgeoning damage, and until the end of it's next turn, its speed is halved and it has disadvantage on any attack roll. On a successful save, the target takes half as much damage and suffers no effects.
If the target is undead, they get disadvantage on the saving throw and it knocks the target prone.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the bludgeoning damage increases by 1d6 damage.

When casted at 5th level,every attack roll adds 1d4 necrotic damage, which increases by spell level.