Cyclops

This is a one-eyed beast whose origin is linked to great titans of history. Instead of fighting against Ulysses, it now acts as sort of an independent contractor, restraining anything that tries to infiltrate the areas surrounding Castlevania. With its strength, short dashes, and a huge hammer, it can do just that; its slow speed, however, gives the common vampire hunter an advantage. And it can only be harmed by striking its eye.

A cyclops was responsible for turning Sypha into stone in Castlevania III: Dracula's Curse and then guarded her statue, until it was defeated by Trevor Belmont and Grant Danasty. Several other Cyclops bosses appeared in that game teamed up with other bosses, such as Mummies and the Leviathan.

In Japan, it is also considered an "Oni" from Japanese mythology (usually translated as Ogre) and depicted with a single horn on its forehead. A more powerful variant of the Cyclops is called the "Red Ogre" in later games. The first occurrence of the red version was in as a cameo in the Castlevania stage for the mascot platformer Wai Wai World 2, which wields the traditional mallet.

The Cyclops returned as a boss in Castlevania: Harmony of Dissonance, where it is quicker, stronger and can execute jumping and dash attacks. The Cyclops returned as a powerful regular enemies in the 3D games Castlevania: Lament of Innocence and Castlevania: Curse of Darkness. While it did not use stone-making attacks in its 2D incarnations, some versions of it were shown to possess a stone gaze in Curse of Darkness.