The Friars of Pangloss were three immortal beings that ruled the galaxy of Pangloss. They were on a planet orbiting a red giant in the centre of the galaxy. Their names were Caphymus, Anonius, and Portellus. According to the Doctor, Portellus was one of the most feared of immortal beings. The Friars were psychic, could transfer their thoughts, control ectoplasm and generate tunnels of pure thought. Heat was the source of their powers.
The Doctor tricked them into permanently separating their minds from their bodies. This caused the planets in their galaxy to cool down, and allowed their slaves to destroy their mindless bodies. (PROSE: Tragedy Day)