Recruit Selene quest guide has been updated.



Ionium was a name given early in the study of radioactive elements to Thorium-230 (230Th), a radioactive isotope of thorium (atomic number 90) which can be used to date corals and determine ocean current flux. The name was used before it became known that ionium and thorium are chemically identical. Thorium has been considered an alternative nuclear fuel to uranium.