Children's Horror book. Creature that doesn't have a Face, sort of slenderman-like creature/ monster. Unique art style. Title has two words like "The ____"? Read in early-mid 2010s. Spoiler.

[Ryan]

Hi, I'm trying to find a book that I distinctly remember reading in the children's section at my local public library when I was a kid during the early to mid 2010s, (although I'm sure the book came out earlier than that). The book itself had a pretty unique art style, and I believe the plot revolved around some sort of slenderman-like creature / monster that didn't have a face. I don't necessarily remember the details of the plot, but at the end of the book the monster is defeated by the protagonist's cat, who attacks the monster and saves the protagonist. I think the title was a two word title like "The ____" but I don't recall any other details other than that. If anyone thinks they might know what book this is, that would be much appreciated!

[Kris]

Ryan, can you describe the unique art style?

I copied some details to the topic header. Feel free to edit it.

[Rainbowheart]

The Wikkeling