Ruler Sword

A Ruler Swords, also called Spectral Swords or Poltergeist is a sword possessed by poltergeist-causing spirits. This sword is able to control a variety of other weapons, which sometimes circle around it or move about in random paths. Destroying the central Ruler Sword destroys all the other weapons being controlled by it.

Castlevania: The Adventure ReBirth
The Spectral Sword returns in stage 3 of The Adventure ReBirth, this time as a boss. The sword resembles two Final Swords from Aria of Sorrow, which sometimes open up to spawn new weapons. The weapons, in this case, are daggers, axes, swords, and lances which circle around to protect him. He can stop to fly into the ground, along with any remaining weapons.