[SPOILER WARNING: THIS CHARACTER CONTAINS HEAVY CHARACTER REVELATIONS FOR ACE, JACK, HASTUR, LLOYD, AND HOWARD KING, AND IT SPOILS PART OF THE ENDGAME OF THE ENTIRE STORY OF ACE AND THE CALL OF CTHUHLU. YOU'VE BEEN WARNED]
In the year 2018, a mysterious giant creature has been roaming the lands of Dunwich at a full moon night. It was about 20 feet tall, it has no arms, multiple tendrils, three eyes on its head, one extra eye underneath its head, the yellow sign of Hastur on its belly, and it has been devouring livestock, buildings, and landscapes. I am currently following the beast now, and it's about to devour another livestock. I have to do something about it, but I too scared to get closer. Uh... oh no, it found out that I was following it, I got to get out of here before it eats me whole! *huff huff huff* No No NO, DON'T EAT ME, I DON'T WANT TO DIE I DON'T WANT TO DIE I DON'T WANT TO DIE I DON'T WANT TO DIE!!! AAAAAAAAAAAAAAGH!!!!!!
[Anyways, here come the spoilers. YOU'VE BEEN WARNED]
In the game's story, the giant creature will roam around Dunwich whenever the three full moons of Lunalago are shown in the night sky. This, alongside the Ace and Cthylla marriage storyline will be the major plot line in the second half of Ace and the Call of Cthuhlu. There will be hints to the beast's true identity throughout of the story. This will also be where Howard King will be introduced in the story. Near the end of the second half, it will be revealed that Ace was the giant beast of Dunwich all along named Haa'vahstivia, the Eater of Worlds. An eldritch abomination destined to surpass even the Outer Gods themselves, including the likes of Yog-Sothoth and Azathoth, the two most powerful Lovecraftians in the universe. This is where Howard King reveals himself to be Hastur, the King in Yellow. This bombshell, alongside Ace finding out that Lloyd and them are related to each other, it mentally breaks them, changing their worldview in every way.