YMMV / Atop The Fourth Wall The Machinations Of Worms

• Complete Monster: The King of Worms is the youngest of the Entity's family of Eldritch Abominations, but makes up for its comparative lack of power in sheer sadism. The only one of its kind capable of understanding fear, the King had its visage scarred by the alien emotion and set out to master fear, initially so it could heal its face. However, the King soon began to covet its power so it could subjugate its fellow Outer Gods, sending its clockwork servants throughout the multiverse to learn more about fear. Coming across a world that had never felt strife or pain, the King introduced nightmares that drove the populace insane and caused them to violently butcher each other; the sole survivor was granted restored sanity by the King, who built its first throne upon their despairing soul. Upon learning of the Entity committing suicide, the King abducts Linkara so it can shred his very soul to learn what fear drove its elder cousin to kill itself, intent on spreading this fear "to every being, everywhere, forever."
• Seasonal Rot: While it has a few fan favorite moments, such as the creation of Eliza and the fight with Mirrorkara in the 400th episode, this arc is often considered by fans to be one of the weakest arcs of the show. This is mostly due to many fans perceiving the arc as a retread of A Piece Of The World Is Missing, and it didn't help that The King of Worms was considered a letdown after being hyped up so much.