Resentment Blade

Introduction
The Resentment Blade was a sword created during the Plorkian Wars, containing one single tear dropped by Plork. It was designed in secret by Kirby Enterprises using blueprints provided by a mysterious man. Shortly after its creation, Chuck burned the blueprints and stole it from Kirby labs, hiding it somewhere in Real Earth.

It's currently in posession of Megan Remnants.

Powers
Theoretically, Resentment Blade is capable of finding traces of Real Love in the universe and destroy it forever to be replaced by Fake Love (King's Love). According to Joey Isotope, that's the objective of Megan Remnants.

It has no use in battle and has never been used. Chuck mentioned that it can only be used once before the power of the tear is gone.