Larimar

The Ice Monster is a corrupted Gem that first appeared in "Monster Buddies". She was healed along with the other corrupted gems in "Change Your Mind"

Appearance
She possesses a bulky body that is colored varying icy shades of blue. The creature also possesses two, very large arms with four spiky fingers each and two short legs. Her head is carved into five, sharp protrusions. She has two dark, hexagonal eyes and a gaping, dark mouth lined with sharp teeth. This monster is slightly taller than Garnet.

Despite this, however, when she is uncorrupted she is extremely small in size.

"Monster Buddies"
The Crystal Gems are shown fighting this monster in a large cavern inside a snowy mountain. She's shown to be preventing them from acquiring a powerful, elemental artifact called the Shooting Star. After her arm falls off, Garnet deals the final blow on her, thus, defeating the monster. Pearl bubbles her gem and transports it back to the Burning Room. Her gem is seen again when Garnet bubbles Steven to the Burning Room and is later seen again when Steven bubbles the Centipeetle Mother's gemstone to the room along with the "Chaaaaps".

Trivia

 * Ice Monster, as well as a stronger version of Ice Monster, appear as antagonists in the Steven Universe flash game, "Sword Dancers".
 * The Ice Monster bears a resemblance to a Freezie from the Super Mario series, except she has arms and legs.

Gemstone
pt-br: Monstro de Gelo