Clay monsters

The clay monsters are clay models brought to life with Harry Claymore's use of black magic. They went mad and turned on their creator after 3D computer generated animation was invented and they were no longer needed in stop-motion claymation movies.

Cyclops
It appears in the Loinclothiclese movie that the Pines family watches at the beginning of Clay Day. It has one eye and a yellow color. The clay monster also has a long tongue, fangs, and big ears. It captures Soos and Stan Pines and puts them in clay. Mabel turns it into "Shimmery Twinkleheart" from Believe in Yourself, and it helps Mabel defeat the other clay monsters.

Skeleton army
They emerge from the ground and attack Dipper and Mabel. They then stand guard as the Cyclops buried Dipper, Stan and Soos in clay.

Medusa with a scorpion body
It tries to fight Shimmery Twinkleheart, but they both become a mass of melted clay.

Unicorns
Four unicorns fall from the above to join the battle with the other clay monsters. They dropped into the large mass of clay.