Gore is first seen with Specter when they find Ian speeding while driving in Barley's van Guinevere with Ian and half of their father Wilden while on their way to Raven's Point to find the Phoenix Gem. To avoid getting caught, Ian and Barley use a lie spell to disguise themselves as their mother's boyfriend Colt Bronco in order to avoid getting arrested. While talking to "Colt," Gore refers to Barley as a "screw-up," much to Barley's chagrin, but Ian lies that he disagrees, causing the spell to begin to wear off. However, the brothers manage to get away before the spell could wear off completely.
She, Specter, and Colt later appear during the climax of the film where they chase Ian and Barley again. To avoid getting caught, Barley sacrifices Guinevere by putting a rock on the gas pedal and crashing it into a mountain, blocking the cops' path.
Her further fate is unknown after Ian brought back the rest of Wilden, and broke the curse with the help of Laurel and Corey the Manticore.
"Gore" is an English verb that refers to an ungulate (specifically a bull, a ram, or a goat) that uses its horns to attack its enemies.