 SCP-770 is a strain of mold that is similar in appearance to the common viscerum polycephalum slime mold. It is largely colorless and translucent in appearance and will adhere to almost any surface. What sets SCP-770 apart is that it respires without oxidation by means of a poorly understood nuclear reaction. SCP-770 will absorb any radioactive isotopes or any isotopes larger in atomic mass than Iron-56 with preference given to heavier isotopes. These isotopes will then undergo a nuclear reaction in which they are reduced to more stable isotopes and energy is released. The decay products of this reaction, normally lighter elements such as carbon, oxygen or nitrogen, along with the energy produced, are used by SCP-770 as a source of sustenance so it may grow and reproduce.