Drill! Drill! My drill will go right through you!
— Giant Drillmon
The Giant Drillmon is a creature that is fought as a boss in Gorge of Oath.
There is nothing else known about the Giant Drillmon other than that it supposedly never comes out into the daylight if it can help it.
Gorge of Oath
The Giant Drillmon has several different attacks. The first one is an attack similar to that of a common Drillmon. The Giant Drillmon uses its horn on the rear to attack players however it can rush across the entire room doing so. Then it has a drilling attack that hits anything around the drill and rocks fly out of it at different angles. Lastly, the Giant Drillmon can drop a ball of massive energy which does great damage in contact.
In Grand Chase Dimensional Chaser, the Shadow Drillmon is an Assault-type boss fought in Act 25.6: ???. It has the same appearance as the Giant Drillmon from the Gorge of Oath but instead has parts of its body seemingly corrupted.