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The Xeraphin are highly psychic beings, able to wield psychokinetic energy, possess people in order to communicate, exert a hypnotic influence over people, and telepathically project components of their gestalt — such as people who had been absorbed into it — into other locations, even the interior of a TARDIS.
The power of the Xeraphin was controlled by two aspects, good and evil, of the same personality. The Master was able to access the Xeraphin power to perform what seemed to be conjuring tricks, as well as to create mass hallucinations, but the schism within the Xeraphin meant that the power was unstable — sometimes it worked for him, but sometimes it worked against him.
The Xeraphin were thought to have become extinct after the Vardon-Kosnax War, which their home planet Xeriphas was caught in the cross-fire of the war causing it to be radiated, but the survivors fled to Earth and built a great citadel after their spacecraft crash-landed. Suffering from radiation poisoning, the Xeraphin merged into a single bioplasmic organism. In this state they hoped to survive until the poisoning wore off. However, as the moment of their regeneration neared, the Master also arrived on Earth, his TARDIS having been damaged enough to leave him stranded there. In need of a new power source, the Master was irresistibly drawn to the Xeraphin sanctum and its power. At the moment of their regeneration, when the first-reborn Xeraphin emerged, the Master destroyed them with his Tissue Compression Eliminator. The Xeraphin retreated back to their resting place, and were apparently able to expel the Master from their sanctum.
Through the projection of his mind, the Master was able to communicate with the baseness of the Xeraphin being, but his intervention caused a schism in the Xeraphin nature that divided them into a good half and an evil half. The good half of the Xeraphin, which aided Tegan and Nyssa and resisted the Master, wanted to defeat the Master and become corporeal. The evil half of the Xeraphin, which had been aiding the Master, wanted to have its power used by the Master and feared by all others. The side that won would gain control of all the Xeraphin power.