All-out empowerment

Your weapon is covered in what seems to be a mystical light. When attacked with the empowered weapon the target must make a CON save of 30 + WIS modifier + 1d4. On a failed save the target MUST stop all actions, bonus actions and reactions and fall prone, you do not take damage from it's previous attack. On the next round, if the target is not killed, it is sent to the abyssal plane and is unable to be followed. On a successful save, the target MUST disengage and try to flee the fight as best as possible and will avoid the PCs for the next month until the spell ends, you take damage from the enemies attack, reducing you to 0HP but not killing you.

At Higher levels: This spell looses its CON save requirement and will always work if in a spell slot of 3rd level or above.

This spell can only be used ONCE by a PC for the entire campaign - also only applicable to Shortswords, Longswords and Sword of banishment(my other homebrew)