Alastor

Alastor (also called a Vandal Sword or simply a Spectre') is Ghost Swordsman who possesses a very large sword. He is a counterpart to the female rapier-wielding Nemesis. He fades in and out of view, and swings his massive sword around. Only the sword can be injured.

Alastor is the ghost form of the Sword Lord in Castlevania: Symphony of the Night. After destroying the Sword Lord's armor, Alastor is revealed from within and must himself be destroyed. A massive variation of Alastor which does not possess a suit of armor, called Azaghal, also appears in this game.

In Aria of Sorrow and Dawn of Sorrow, the Alastor Soul allows you to control the Alastor as a Familiar, which is similar to the Sword Familiar found in Symphony of the Night.

In Greek mythology, Alastor is a spirit of retribution against those who committed evil deeds, while Nemesis punishes those who offend the gods.