A Giant Scorpion is a huge monster scorpion. Daedalus, under the alias of Quintus, ordered some giant scorpions from Triple G Ranch. He kept them in boxes in the Sword Fighting Arena. He eventually let them out in the camp's forest during Capture the Flag.
In response to Orion's overhunting, the earth protogenos Gaea stirred from her slumber and sent a giant scorpion to kill him. When Artemis found Orion's deceased body, she honored him in the stars, with the scorpion in particular becoming the constellation Scorpio.