Yliaster or Iliaster, a term coined by Paracelsus, refers to "prime matter, consisting of body and soul".
Paracelsus described the Iliaster as the "completely healed human being who has burned away all the dross of his lower being and is free to fly as the Phoenix.
"[1] It is most likely a portmanteau of the Greek hyle (matter) and Latin astrum (star).
Only the supreme Master could release them and form them with tender solicitude, so that other things could be created from the rest.
It is the formless base of all matter which is the raw material for the alchemical Great Work.