Psychoplasm

Psychoplasm was a material from which artificial micro-universes known as psychoscapes could be created, including the Dalek-scapes of the Dalek Dome. If the psychoplasmic constructs within a psychoscape left the scape's dedicated chamber within the Dome, as demonstrated when the Fourteenth Doctor's TARDIS transferred them out, then the psychoplasm would begin to melt, as the material could not survive beyond the dome for long.

When the Daleks of the Golden City Zone discovered their nature as simulacra, they took control of the Dome and began construction of a quantum-powered reality gate to enter the real world. To bring through his entire Dalek Fleet, the Golden Emperor ordered the other Dalek-scapes broken down into psychoplasm as raw material. When the Fourteenth Doctor collapsed the reality gate, all Dalek constructs that had made it to the real world melted into psychoplasm. He later discovered that the Jules Rimet Trophy from the Earth Invasion Zone had also melted over his console. (COMIC: Liberation of the Daleks ^[+]Loading...["Liberation of the Daleks (comic story)"])