Yfasue

Yfasue is a demon named in the fifteenth-century magical text Liber de Angelis, where he appears as a subordinate spirit serving the infernal ruler known as the Red Fighter, or Rubeus Pugnator. Both Yfasue and his master belong to the martial sphere of Mars, and their powers are connected with conflict, aggression, domination, and destructive force.

Within the ritual framework of the Liber de Angelis, Yfasue is invoked during the preparation of the Ring of Mars, a talisman intended to embody the violent and warlike qualities traditionally associated with the red planet. His function is not merely ceremonial. He contributes the destructive current that gives the talisman its feared reputation.

Once ritually empowered, the Ring of Mars is described as an object capable of turning hostile force outward against an enemy. In the worldview of the grimoire, the ring becomes more than a symbolic representation of Mars. It is treated as a vessel through which martial power can be concentrated, directed, and unleashed.

Yfasue therefore represents a distinctly aggressive aspect of medieval spirit magic.

Unlike spirits associated with knowledge, treasure, attraction, or concealment, his role centres upon devastation. His power reflects the traditional astrological character of Mars itself, a planet associated with warfare, bloodshed, courage, anger, iron, violence, and the will to overcome opposition.

The title of Yfasue’s superior, Rubeus Pugnator, literally evokes the image of a red warrior or fighter. This martial imagery strengthens the connection between the demon, his master, and the planetary current they embody. The colour red, the influence of Mars, and the destructive purpose of the talisman all belong to the same symbolic field.

What makes Yfasue especially interesting is that, like many spirits found in obscure medieval magical texts, he is known almost entirely through his ritual function.

There is no elaborate legend surrounding him.

There is no long mythology explaining his fall, his appearance, or his personality.

He exists because the operation requires him.

That is one of the most revealing features of texts such as the Liber de Angelis. Their demons are often not characters in stories but forces embedded within magical technology. A spirit is summoned because a ring must be empowered, a planetary influence must be concentrated, or a particular occult effect must be achieved.

Yfasue therefore belongs to a form of Demonology in which the infernal world is inseparable from ritual practice.

His identity is written into the Ring of Mars itself.

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