Embedding Strike

The next time you hit a creature with a light melee weapon attack before the spell ends, the weapon disappears and materializes inside the target, while still dealing the attack's normal damage. 

Until the spell ends, at the start of the target's turn, they must make a constitution saving throw against your spell save DC. A creature takes 1d6 piercing damage and becomes restrained until the start of their next turn on a failed save, or 1d6 piercing damage on a successful one. This damage cannot be reduced in any way. 

This spell has no effect on incorporeal creatures such as ghosts, creatures immune to non-magical piercing damage, or creatures smaller than the weapon used. 

This spell is a homebrew creation